New review comment by JamiKettunen on void-packages repository

https://github.com/void-linux/void-packages/pull/38648#discussion_r945134060

Comment:
Ah nvm attempting to install `PolyMC` pulls in `openjdk11-jre` by default for me on `x86_64-musl`, wonder what exactly makes that the case... Either way this is a bit of a nuanced issue, perhaps @classabbyamp can comment better.

I previously suggested [mentioning the existance of PolyMC's README.voidlinux](https://github.com/void-linux/void-packages/pull/34979#issuecomment-1079054056) but it seems that was completely lost in the comments, but the file should already exist as [`/usr/share/doc/steam/README.voidlinux`](https://github.com/void-linux/void-packages/blob/master/srcpkgs/PolyMC/files/README.voidlinux) on your system.