docs(netcdf): update mf6io extended #3589

Job	Run time
Build	11m 42s
Smoke test	13m 11s
Check format	1m 54s
Extended testing (ubuntu-22.04)	25m 31s
Test GNU fortran (macos-13, false)	35m 30s
Extended testing (macos-13)	41m 48s
Test Intel fortran (ubuntu-22.04)	42m 4s
Test GNU fortran (macos-14, false)	20m 38s
Test Intel fortran (macos-13)	37m 42s
Extended testing (windows-2022)	45m 19s
Test GNU fortran (macos-14, true)	36m 30s
Test Intel fortran (windows-2022)	36m 50s
Test GNU fortran (ubuntu-22.04, false)	43m 4s
Test GNU fortran (ubuntu-22.04, true)	45m 24s
Test GNU fortran (windows-2022, false)	33m 30s
	7h 50m 37s

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