Replace redundant Array#map with Array#each (#7761)
Replace redundant Array#map with Array#each (#7761)

Merge pull request 7761
fulldecent/jekyll,x-way/jekyll,jekyll/jekyll,jaybe-jekyll/jekyll,tillgrallert/jekyll,yhironaka/yhironaka.github.io,chrisfinazzo/jekyll,x-way/jekyll,tillgrallert/jekyll,jaybe-jekyll/jekyll,ryanshaw/jekyll,fulldecent/jekyll,chrisfinazzo/jekyll,tillgrallert/jekyll,tillgrallert/jekyll,ryanshaw/jekyll,jaybe-jekyll/jekyll,fulldecent/jekyll,fulldecent/jekyll,x-way/jekyll,chrisfinazzo/jekyll,tillgrallert/jekyll,chrisfinazzo/jekyll,jaybe-jekyll/jekyll,ryanshaw/jekyll,x-way/jekyll,jekyll/jekyll,ryanshaw/jekyll,jekyll/jekyll,jekyll/jekyll