Write missing man pages -Diff-

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TODO: look through all commands and check if they have manual pages. You can do this by running

cd /sys/man; mk check

For now, just add missing pages you find to the list below (and of course, write manual pages for them).

• mm(6)
• lots of other things in /sys/lib/tmac/ (tmac explains what the files seem to be for)

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