docs(mf6io): update mf6io markdown and tex files (#1591) #12

Job	Run time
Draft reset PR	0s
Draft release	0s
Set release options	4s
Make distribution / Build binaries (ubuntu-20.04)	22m 51s
Make distribution / Build binaries (macos-12)	22m 17s
Make distribution / Build binaries (windows-2022)	33m 41s
Make distribution / Build docs	7m 11s
Make distribution / Build distribution (ubuntu-22.04)	7m 41s
Make distribution / Build distribution (macos-12)	12m 47s
Make distribution / Build distribution (windows-2022)	12m 51s
Draft release PR	28s
	1h 59m 51s

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