docs(netcdf): update mf6io extended #3577

Job	Run time
Smoke test	14m 41s
Build	14m 26s
Check format	1m 48s
Test Intel fortran (ubuntu-22.04)	40m 0s
Test GNU fortran (macos-13, false)	51m 0s
Test Intel fortran (macos-13)	31m 50s
Extended testing (ubuntu-22.04)	28m 38s
Test GNU fortran (macos-14, false)	22m 42s
Test Intel fortran (windows-2022)	35m 43s
Extended testing (macos-13)	52m 23s
Test GNU fortran (macos-14, true)	32m 37s
Extended testing (windows-2022)	1h 1m 45s
Test GNU fortran (ubuntu-22.04, false)	42m 57s
Test GNU fortran (ubuntu-22.04, true)	1h 45m 10s
Test GNU fortran (windows-2022, false)	30m 42s
	9h 26m 22s

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