Remove TI_SIMPLELINK_SDK_ROOT from persistent-storage docs

[mspang]

Problem

This variable is not used since bbbf7ce ("Add CC13X2_26X2 to github
C/I (#16638)").

Change overview

Remove it from the readme.

Testing

Docs only change.

[github-actions]

PR #17709: Size comparison from 736f4b3 to 51e3e0e

Full report (32 builds for cc13x2_26x2, cyw30739, efr32, esp32, k32w, linux, mbed, nrfconnect, p6, telink)

platform	target	config	section	736f4b3	51e3e0e	change	% change
cc13x2_26x2	all-clusters-app	LP_CC2652R7	(read only)	692071	692071	0	0.0
			(read/write)	159952	159952	0	0.0
			.bss	75008	75008	0	0.0
			.data	3396	3396	0	0.0
			.rodata	105967	105967	0	0.0
			.text	585624	585624	0	0.0
	lock-ftd	LP_CC2652R7	(read only)	678587	678587	0	0.0
			(read/write)	164748	164748	0	0.0
			.bss	73376	73376	0	0.0
			.data	3220	3220	0	0.0
			.rodata	98803	98803	0	0.0
			.text	579300	579300	0	0.0
	lock-mtd	LP_CC2652R7	(read only)	627331	627331	0	0.0
			(read/write)	146172	146172	0	0.0
			.bss	69096	69096	0	0.0
			.data	3220	3220	0	0.0
			.rodata	98683	98683	0	0.0
			.text	528156	528156	0	0.0
	pump-app	LP_CC2652R7	(read only)	651071	651071	0	0.0
			(read/write)	151684	151684	0	0.0
			.bss	73552	73552	0	0.0
			.data	3252	3252	0	0.0
			.rodata	75703	75703	0	0.0
			.text	574880	574880	0	0.0
	pump-controller-app	LP_CC2652R7	(read only)	644139	644139	0	0.0
			(read/write)	151440	151440	0	0.0
			.bss	73600	73600	0	0.0
			.data	3216	3216	0	0.0
			.rodata	78835	78835	0	0.0
			.text	564816	564816	0	0.0
cyw30739	light	cyw930739m2evb_01	(read/write)	623430	623430	0	0.0
			.app_xip_area	526308	526308	0	0.0
			.bss	79780	79780	0	0.0
			.data	692	692	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	lock	cyw930739m2evb_01	(read/write)	618394	618394	0	0.0
			.app_xip_area	522744	522744	0	0.0
			.bss	78340	78340	0	0.0
			.data	656	656	0	0.0
			.rodata	0	0	0	0.0
			.text	0	0	0	0.0
	ota-requestor-no-progress-logging	cyw930739m2evb_01	(read/write)	571126	571126	0	0.0
			.app_xip_area	465840	465840	0	0.0
			.bss	87680	87680	0	0.0
			.data	568	568	0	0.0
			.rodata	0	0	0	0.0
			.text	112	112	0	0.0
efr32	lighting-app	BRD4161A	(read only)	907472	907472	0	0.0
			(read/write)	134912	134912	0	0.0
			.bss	132864	132864	0	0.0
			.data	2044	2044	0	0.0
			.text	907464	907464	0	0.0
		BRD4161A+rpc	(read only)	941888	941888	0	0.0
			(read/write)	151592	151592	0	0.0
			.bss	149344	149344	0	0.0
			.data	2248	2248	0	0.0
			.text	941880	941880	0	0.0
	window-app	BRD4161A	(read only)	844960	844960	0	0.0
			(read/write)	133000	133000	0	0.0
			.bss	131040	131040	0	0.0
			.data	1956	1956	0	0.0
			.text	844952	844952	0	0.0
esp32	all-clusters-app	c3devkit	(read only)	999334	999334	0	0.0
			(read/write)	1473634	1473634	0	0.0
			.dram0.bss	68168	68168	0	0.0
			.dram0.data	14428	14428	0	0.0
			.flash.rodata	206584	206584	0	0.0
			.flash.text	999334	999334	0	0.0
			.iram0.text	62020	62020	0	0.0
		m5stack	(read only)	1053575	1053575	0	0.0
			(read/write)	475624	475624	0	0.0
			.dram0.bss	73688	73688	0	0.0
			.dram0.data	34168	34168	0	0.0
			.flash.rodata	235932	235932	0	0.0
			.flash.text	1048191	1048191	0	0.0
			.iram0.text	123107	123107	0	0.0
k32w	light	k32w061+release	(read/write)	688704	688704	0	0.0
			.bss	81112	81112	0	0.0
			.data	2000	2000	0	0.0
			.text	599792	599792	0	0.0
	lock	k32w061+release	(read/write)	729572	729572	0	0.0
			.bss	81520	81520	0	0.0
			.data	1960	1960	0	0.0
			.text	640292	640292	0	0.0
linux	all-clusters-app	debug	(read only)	2734705	2734705	0	0.0
			(read/write)	172840	172840	0	0.0
			.bss	83136	83136	0	0.0
			.data	1984	1984	0	0.0
			.data.rel.ro	81624	81624	0	0.0
			.dynamic	608	608	0	0.0
			.got	4464	4464	0	0.0
			.init	27	27	0	0.0
			.init_array	992	992	0	0.0
			.rodata	233861	233861	0	0.0
			.text	2326050	2326050	0	0.0
	bridge-app	debug+rpc	(read only)	1890689	1890689	0	0.0
			(read/write)	120304	120304	0	0.0
			.bss	71168	71168	0	0.0
			.data	3424	3424	0	0.0
			.data.rel.ro	40392	40392	0	0.0
			.dynamic	592	592	0	0.0
			.got	4032	4032	0	0.0
			.init	27	27	0	0.0
			.init_array	680	680	0	0.0
			.rodata	159633	159633	0	0.0
			.text	1608322	1608322	0	0.0
	chip-tool	debug	(read only)	10944493	10944493	0	0.0
			(read/write)	375760	375760	0	0.0
			.bss	22592	22592	0	0.0
			.data	1136	1136	0	0.0
			.data.rel.ro	345768	345768	0	0.0
			.dynamic	624	624	0	0.0
			.got	4952	4952	0	0.0
			.init	27	27	0	0.0
			.init_array	648	648	0	0.0
			.rodata	547349	547349	0	0.0
			.text	9557237	9557237	0	0.0
	chip-tool-no-interactive-ipv6only	arm64	(read only)	10555900	10555900	0	0.0
			(read/write)	497681	497681	0	0.0
			.bss	40897	40897	0	0.0
			.data	1192	1192	0	0.0
			.data.rel.ro	393088	393088	0	0.0
			.dynamic	560	560	0	0.0
			.got	58680	58680	0	0.0
			.init	24	24	0	0.0
			.init_array	184	184	0	0.0
			.rodata	521228	521228	0	0.0
			.text	8916868	8916868	0	0.0
	lighting-app	debug+rpc	(read only)	2326129	2326129	0	0.0
			(read/write)	151256	151256	0	0.0
			.bss	73216	73216	0	0.0
			.data	1984	1984	0	0.0
			.data.rel.ro	70328	70328	0	0.0
			.dynamic	608	608	0	0.0
			.got	4320	4320	0	0.0
			.init	27	27	0	0.0
			.init_array	784	784	0	0.0
			.rodata	183697	183697	0	0.0
			.text	1975842	1975842	0	0.0
	lock-app	debug	(read only)	2206465	2206465	0	0.0
			(read/write)	145640	145640	0	0.0
			.bss	71808	71808	0	0.0
			.data	1504	1504	0	0.0
			.data.rel.ro	66664	66664	0	0.0
			.dynamic	592	592	0	0.0
			.got	4312	4312	0	0.0
			.init	27	27	0	0.0
			.init_array	736	736	0	0.0
			.rodata	192161	192161	0	0.0
			.text	1854354	1854354	0	0.0
	ota-provider-app	debug	(read only)	2059217	2059217	0	0.0
			(read/write)	138888	138888	0	0.0
			.bss	71232	71232	0	0.0
			.data	1672	1672	0	0.0
			.data.rel.ro	60216	60216	0	0.0
			.dynamic	608	608	0	0.0
			.got	4480	4480	0	0.0
			.init	27	27	0	0.0
			.init_array	640	640	0	0.0
			.rodata	174235	174235	0	0.0
			.text	1727522	1727522	0	0.0
	ota-requestor-app	debug	(read only)	2090465	2090465	0	0.0
			(read/write)	141664	141664	0	0.0
			.bss	71872	71872	0	0.0
			.data	1928	1928	0	0.0
			.data.rel.ro	62248	62248	0	0.0
			.dynamic	592	592	0	0.0
			.got	4320	4320	0	0.0
			.init	27	27	0	0.0
			.init_array	664	664	0	0.0
			.rodata	170588	170588	0	0.0
			.text	1760930	1760930	0	0.0
	shell	debug	(read only)	2560473	2560473	0	0.0
			(read/write)	196808	196808	0	0.0
			.bss	113768	113768	0	0.0
			.data	1360	1360	0	0.0
			.data.rel.ro	75952	75952	0	0.0
			.dynamic	592	592	0	0.0
			.got	4184	4184	0	0.0
			.init	27	27	0	0.0
			.init_array	920	920	0	0.0
			.rodata	215538	215538	0	0.0
			.text	2183074	2183074	0	0.0
	thermostat-no-ble	arm64	(read only)	2367612	2367612	0	0.0
			(read/write)	174353	174353	0	0.0
			.bss	86097	86097	0	0.0
			.data	1488	1488	0	0.0
			.data.rel.ro	78992	78992	0	0.0
			.dynamic	560	560	0	0.0
			.got	4744	4744	0	0.0
			.init	24	24	0	0.0
			.init_array	368	368	0	0.0
			.rodata	145484	145484	0	0.0
			.text	1993072	1993072	0	0.0
	tv-app	debug	(read only)	2844233	2844233	0	0.0
			(read/write)	276536	276536	0	0.0
			.bss	189112	189112	0	0.0
			.data	4640	4640	0	0.0
			.data.rel.ro	76560	76560	0	0.0
			.dynamic	592	592	0	0.0
			.got	4696	4696	0	0.0
			.init	27	27	0	0.0
			.init_array	920	920	0	0.0
			.rodata	215979	215979	0	0.0
			.text	2445842	2445842	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2411348	2411348	0	0.0
			.bss	205660	205660	0	0.0
			.data	5848	5848	0	0.0
			.text	1373948	1373948	0	0.0
nrfconnect	all-clusters-app	nrf52840dk_nrf52840	(read/write)	1177355	1177355	0	0.0
			bss	141784	141784	0	0.0
			rodata	150076	150076	0	0.0
			text	806852	806852	0	0.0
p6	all-clusters-app	default	(read/write)	2526840	2526840	0	0.0
			.bss	139040	139040	0	0.0
			.data	2784	2784	0	0.0
			.text	1485104	1485104	0	0.0
	light-app	default	(read/write)	2418592	2418592	0	0.0
			.bss	132520	132520	0	0.0
			.data	2584	2584	0	0.0
			.text	1376856	1376856	0	0.0
	lock-app	default	(read/write)	2422784	2422784	0	0.0
			.bss	132320	132320	0	0.0
			.data	2544	2544	0	0.0
			.text	1381048	1381048	0	0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	807880	807880	0	0.0
			bss	75216	75216	0	0.0
			noinit	40416	40416	0	0.0
			text	571680	571680	0	0.0