string.c (str_uminus): update doc for deduplication
As of r57698, String#-@ can return pre-existing strings.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57813 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
string.c (str_uminus): update doc for deduplication
As of r57698, String#-@ can return pre-existing strings.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57813 b2dd03c8-39d4-4d8f-98ff-823fe69b080e