Document that multiple windows are not supported on Android #5631

Job	Run time
Check formatting	3s
Run cargo-deny on Android	24s
Run cargo-deny on iOS	21s
Run cargo-deny on Linux	30s
Test stable Windows 64bit MSVC	1m 51s
Run cargo-deny on macOS	21s
Test stable Windows 32bit MSVC	2m 8s
Run cargo-deny on Redox OS	21s
Test stable Windows 64bit GNU	2m 6s
Run cargo-deny on web	21s
Test stable Windows 32bit GNU	2m 6s
Run cargo-deny on Windows	24s
Test stable Linux 32bit	3m 35s
Test stable Linux 64bit	3m 40s
Test stable X11	2m 10s
Test stable Wayland	2m 31s
Test stable Android	57s
Test stable Redox OS	28s
Test stable macOS	2m 51s
Test stable iOS x86_64	1m 45s
Test stable iOS Aarch64	2m 24s
Test stable web	1m 37s
Test nightly Windows 64bit MSVC	1m 37s
Test nightly Windows 32bit MSVC	1m 33s
Test nightly Windows 64bit GNU	2m 2s
Test nightly Windows 32bit GNU	2m 10s
Test nightly Linux 32bit	2m 47s
Test nightly Linux 64bit	2m 21s
Test nightly X11	2m 17s
Test nightly Wayland	2m 23s
Test nightly Android	1m 3s
Test nightly Redox OS	1m 24s
Test nightly macOS	2m 19s
Test nightly iOS x86_64	1m 54s
Test nightly iOS Aarch64	1m 16s
Test nightly web	1m 2s
Test 1.70.0 Windows 64bit MSVC	53s
Test 1.70.0 Windows 32bit MSVC	1m 2s
Test 1.70.0 Windows 64bit GNU	59s
Test 1.70.0 Windows 32bit GNU	1m 0s
Test 1.70.0 Linux 32bit	1m 19s
Test 1.70.0 Linux 64bit	1m 2s
Test 1.70.0 X11	1m 5s
Test 1.70.0 Wayland	52s
Test 1.70.0 Redox OS	25s
Test 1.70.0 macOS	1m 12s
Test 1.70.0 iOS x86_64	55s
Test 1.70.0 iOS Aarch64	58s
Test 1.70.0 web	45s
Test 1.70.0 Android	42s
Test nightly web Atomic	1m 14s
	1h 13m 25s

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