New review comment by Piraty on void-packages repository

https://github.com/void-linux/void-packages/pull/23746#discussion_r471107741

Comment:
1. too much nesting in second sentence. (around `and`)
1. checkdepends are treated like hostdepends
1. you could mention the `XBPS_CHECK_PKGS` switch / `-Q` flag up front of the paragraph