Whoever made that PR is my actual hero
That was me! The redirect was annoying me too, I use Cranelift for my compiler and somehow Firefox decided that cranelift-codegen v0.36.0 is really the version it wants to keep in suggestions (Cranelift is on 0.51.0 right now).
There's actually a crazy story behind the PR - The main way to contribute to docs.rs for a long time was with Vagrant, which spun up a whole VM that you provisioned over SSH. I tried using it and it ... didn't work. Long story short, I actually ended up writing a whole new Docker deploy system just so I could build the site locally 
. Actually merging the PR came about a month later.
I've been meaning to write a blog post about this, I might get around to that today.