yes. it's the source repo for whatever app you want improved man pages on. Everyone can submit changes to it. All the good ones get merged in. It's effectively a wiki curated by the most knowledgeable people on the subject.

um solves a different problem though. It's not trying to make a _common_ man page. It's trying to make a man page that works _for you_. What _you_ need to be highlighted is likely different from what _I_ need to be highlighted.

Personally I don't _want_ a generic wiki man page for stuff. I like the man pages written by the creators of the code (because i know they're correct), combined with my notes highlighting what's important to me.