New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/40837#discussion_r1035131670

Comment:
Don't use `INSTALL.msg` in this manner; use `README.voidlinux` as abby recommended. That's the idiomatic way to document information specifically related to our packaging of the software. `INSTALL.msg` is meant as a last-ditch attempt to convey critical information, mostly about potentially breaking changes, even though these messages show up in an already noisy environment.