Include docs for `{{ page.collection }}` (#7430)
Include docs for `{{ page.collection }}` (#7430)

Merge pull request 7430
tillgrallert/jekyll,tillgrallert/jekyll,x-way/jekyll,chrisfinazzo/jekyll,tillgrallert/jekyll,chrisfinazzo/jekyll,yhironaka/yhironaka.github.io,x-way/jekyll,Strangehill/jekyll,jaybe-jekyll/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll,Strangehill/jekyll,fulldecent/jekyll,chrisfinazzo/jekyll,tillgrallert/jekyll,x-way/jekyll,fulldecent/jekyll,tillgrallert/jekyll,jaybe-jekyll/jekyll,jekyll/jekyll,ryanshaw/jekyll,Strangehill/jekyll,ryanshaw/jekyll,jekyll/jekyll,jekyll/jekyll,chrisfinazzo/jekyll,fulldecent/jekyll,Strangehill/jekyll,jaybe-jekyll/jekyll,x-way/jekyll,fulldecent/jekyll,ryanshaw/jekyll,jekyll/jekyll,ryanshaw/jekyll