Move updates from generated file to source file
Move updates from generated file to source file

#7464 and #7671 erroneously made changes to the auto-generated document
`docs/_docs/contributing.md` instead of the source file
`.github/CONTRIBUTING.markdown`

x-way/jekyll,ryanshaw/jekyll,tillgrallert/jekyll,fulldecent/jekyll,fulldecent/jekyll,x-way/jekyll,tillgrallert/jekyll,Strangehill/jekyll,yhironaka/yhironaka.github.io,fulldecent/jekyll,ryanshaw/jekyll,jekyll/jekyll,Strangehill/jekyll,jekyll/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll,ryanshaw/jekyll,jaybe-jekyll/jekyll,chrisfinazzo/jekyll,x-way/jekyll,chrisfinazzo/jekyll,chrisfinazzo/jekyll,Strangehill/jekyll,chrisfinazzo/jekyll,x-way/jekyll,tillgrallert/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll,tillgrallert/jekyll,jekyll/jekyll,ryanshaw/jekyll,fulldecent/jekyll,jaybe-jekyll/jekyll,jekyll/jekyll,tillgrallert/jekyll