docs(netcdf): update mf6io extended #3596

Job	Run time
Build	1m 54s
Check format	2m 14s
Smoke test	6m 27s
Test Intel fortran (ubuntu-22.04)	42m 9s
Test GNU fortran (macos-13, false)	34m 31s
Test Intel fortran (macos-13)	39m 29s
Extended testing (ubuntu-22.04)	19m 12s
Test GNU fortran (macos-14, false)	20m 10s
Test Intel fortran (windows-2022)	1h 12m 21s
Extended testing (macos-13)	47m 38s
Test GNU fortran (macos-14, true)	35m 52s
Extended testing (windows-2022)	1h 40m 27s
Test GNU fortran (ubuntu-22.04, false)	38m 5s
Test GNU fortran (ubuntu-22.04, true)	1h 39m 25s
Test GNU fortran (windows-2022, false)	35m 41s
	9h 55m 35s

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