Add example for String#scrub
[Feature #6321] [Feature #6752] [Bug #7967]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40391 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Add example for String#scrub
[Feature #6321] [Feature #6752] [Bug #7967]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40391 b2dd03c8-39d4-4d8f-98ff-823fe69b080e