fix(mf6io): cleanup description of EVAPORATION keyword in SFE and LKE… #3623

Job	Run time
Build	2m 18s
Check format	2m 21s
Smoke test	5m 56s
Test Intel fortran (ubuntu-22.04)	40m 52s
Extended testing (ubuntu-22.04)	18m 16s
Test GNU fortran (macos-13, false)	28m 27s
Test Intel fortran (macos-13)	27m 8s
Extended testing (macos-13)	35m 21s
Test Intel fortran (windows-2022)	36m 6s
Test GNU fortran (macos-14, false)	20m 25s
Extended testing (windows-2022)	49m 59s
Test GNU fortran (macos-14, true)	33m 18s
Test GNU fortran (ubuntu-22.04, false)	38m 0s
Test GNU fortran (ubuntu-22.04, true)	1h 31m 53s
Test GNU fortran (windows-2022, false)	32m 57s
	7h 43m 17s

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