fix(mf6io): cleanup typos in the gwe section of mf6io #3612

Job	Run time
Build	2m 13s
Check format	1m 47s
Smoke test	5m 59s
Extended testing (ubuntu-22.04)	18m 15s
Test Intel fortran (ubuntu-22.04)	40m 41s
Extended testing (macos-13)	42m 15s
Test Intel fortran (macos-13)	37m 48s
Test GNU fortran (macos-13, false)	32m 11s
Extended testing (windows-2022)	51m 13s
Test Intel fortran (windows-2022)	35m 51s
Test GNU fortran (macos-14, false)	20m 18s
Test GNU fortran (macos-14, true)	33m 56s
Test GNU fortran (ubuntu-22.04, false)	38m 44s
Test GNU fortran (ubuntu-22.04, true)	1h 33m 5s
Test GNU fortran (windows-2022, false)	34m 57s
	8h 9m 13s

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