chore(ListReader.f90): cleanup docstrings in ListReader utility #1905

Job	Run time
Build	1m 43s
Check format	2m 9s
Smoke test	4m 0s
Test gnu fortran (ubuntu-22.04)	25m 15s
Test gnu fortran (macos-12)	42m 8s
Parallel testing (ubuntu-22.04)	10m 27s
Test gnu fortran (windows-2022)	32m 56s
Test intel fortran (ubuntu-22.04, intel-classic, 2021.7)	26m 2s
Parallel testing (macos-12)	15m 34s
Test intel fortran (macos-12, intel-classic, 2021.7)	34m 21s
Test intel fortran (windows-2022, intel-classic, 2021.7)	38m 10s
	3h 52m 45s

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