docs for String#casecmp and String#casecmp?
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57886 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
docs for String#casecmp and String#casecmp?
return nil; modify examples to better show difference to <=>;
fix RDoc markup and typos.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57886 b2dd03c8-39d4-4d8f-98ff-823fe69b080e