doc/syntax/literals.rdoc: spelling fix

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49062 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-12-30

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49063 b2dd03c8-39d4-4d8f-98ff-823fe69b080e