chore(gwf3maw8.f90): cleanup docstrings in LAK #1352

Job	Run time
Check format	1m 34s
Build	2m 57s
Smoke test	3m 39s
Test gnu fortran (ubuntu-22.04)	24m 58s
Parallel testing (ubuntu-22.04)	9m 25s
Test gnu fortran (macos-12)	38m 22s
Test intel fortran (ubuntu-22.04, intel-classic, 2021.7)	23m 18s
Parallel testing (macos-12)	20m 46s
Test gnu fortran (windows-2022)	30m 28s
Test intel fortran (macos-12, intel-classic, 2021.7)	35m 10s
Test intel fortran (windows-2022, intel-classic, 2021.7)	35m 40s
	3h 46m 17s

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