chore(gwf3maw8.f90): cleanup docstrings in MAW (#1450) #1357

Job	Run time
Build	2m 43s
Smoke test	5m 33s
Check format	1m 34s
Parallel testing (ubuntu-22.04)	9m 5s
Parallel testing (macos-12)	12m 12s
Test gnu fortran (ubuntu-22.04)	23m 10s
Test intel fortran (ubuntu-22.04, intel-classic, 2021.7)	23m 32s
Test gnu fortran (macos-12)	36m 21s
Test intel fortran (macos-12, intel-classic, 2021.7)	26m 25s
Test gnu fortran (windows-2022)	30m 37s
Test intel fortran (windows-2022, intel-classic, 2021.7)	32m 30s
	3h 23m 42s

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