Correct Doc::Scanner#look docs.

        @input.scan(@ident_pattern)

      end

      # Looks for the existance of pattern.  Returns true on success.

      # Doesn't advance the scan pointer.

      # Looks for the existance of pattern.  Returns the matching

      # string on success, nil on failure, but doesn't advance the

      # scan pointer.

      def look(re)

        @input.check(re)

      end