Document remap for both Injections and At usages
In a recent code cleanup session with Sponge, I found that many injections that were targeting methods that were mapped to classes like java.util.List, java.util.UUID etc. would fail to be remapped (for obvious reasons) and the Mixin AP would output a warning. I found that this wasn't really well documented in the wiki, so I'm suggesting that it is documented and made aware for mods alike to correctly mark those injections as remap = false.
I only found this out due to the warnings output from Mixin's AP, but still, it's worth documenting.
Yeah I've observed that remap is one of the least understood arguments, though it is currently documented in the javadoc (as are most things) though I will make a note to include it in the AP documentation when I get to that.