updates formatting

Author: cjdb

libcxx/include/string_view

@@ -690,7 +690,7 @@ private:
   const value_type* __data_;
   size_type __size_;
 
-  template<class, class, class>
+  template <class, class, class>
   friend class basic_string;
 };
 _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(basic_string_view);