Fix typo in racc english documentation [ci skip]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51854 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Fix typo in racc english documentation [ci skip]
"conversion". [Fix GH-1016]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51854 b2dd03c8-39d4-4d8f-98ff-823fe69b080e