Remove redundant 'like' from doc of slice! method [ci skip]

activesupport/lib/active_support/multibyte/chars.rb

@@ -86,7 +86,7 @@ def split(*args)
         @wrapped_string.split(*args).map { |i| self.class.new(i) }
       end
 
-      # Works like like <tt>String#slice!</tt>, but returns an instance of
+      # Works like <tt>String#slice!</tt>, but returns an instance of
       # Chars, or nil if the string was not modified.
       def slice!(*args)
         chars(@wrapped_string.slice!(*args))