Fix typo from 'Github' to 'GitHub' (#7691)
Fix typo from 'Github' to 'GitHub' (#7691)

Merge pull request 7691
ryanshaw/jekyll,ryanshaw/jekyll,ryanshaw/jekyll,Strangehill/jekyll,x-way/jekyll,fulldecent/jekyll,chrisfinazzo/jekyll,chrisfinazzo/jekyll,fulldecent/jekyll,jekyll/jekyll,jaybe-jekyll/jekyll,yhironaka/yhironaka.github.io,jaybe-jekyll/jekyll,tillgrallert/jekyll,x-way/jekyll,tillgrallert/jekyll,jekyll/jekyll,x-way/jekyll,Strangehill/jekyll,Strangehill/jekyll,chrisfinazzo/jekyll,jekyll/jekyll,fulldecent/jekyll,chrisfinazzo/jekyll,tillgrallert/jekyll,jaybe-jekyll/jekyll,x-way/jekyll,tillgrallert/jekyll,fulldecent/jekyll,jekyll/jekyll,ryanshaw/jekyll,Strangehill/jekyll,tillgrallert/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll