add/change some comments in node_extended_grapheme_cluster() [ci skip]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66123 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
add/change some comments in node_extended_grapheme_cluster() [ci skip]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66123 b2dd03c8-39d4-4d8f-98ff-823fe69b080e