Remove override to Jekyll::Document#respond_to? (#7695)
Remove override to Jekyll::Document#respond_to? (#7695)

Merge pull request 7695
jekyll/jekyll,Strangehill/jekyll,tillgrallert/jekyll,fulldecent/jekyll,Strangehill/jekyll,chrisfinazzo/jekyll,Strangehill/jekyll,tillgrallert/jekyll,ryanshaw/jekyll,jaybe-jekyll/jekyll,chrisfinazzo/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll,ryanshaw/jekyll,tillgrallert/jekyll,x-way/jekyll,chrisfinazzo/jekyll,fulldecent/jekyll,tillgrallert/jekyll,ryanshaw/jekyll,jekyll/jekyll,yhironaka/yhironaka.github.io,x-way/jekyll,jaybe-jekyll/jekyll,jaybe-jekyll/jekyll,Strangehill/jekyll,chrisfinazzo/jekyll,x-way/jekyll,ryanshaw/jekyll,jekyll/jekyll,fulldecent/jekyll,fulldecent/jekyll,jekyll/jekyll,x-way/jekyll,tillgrallert/jekyll