SR-11902: Fixed code review issues

Author: kitaisreal

include/swift/AST/DiagnosticsSema.def

@@ -2711,8 +2711,7 @@ NOTE(missing_member_type_conformance_prevents_synthesis, none,
      "of %3 to %2",
      (unsigned, Type, Type, Type))
 NOTE(classes_automatic_protocol_synthesis,none,
-    "automatic synthesis of '%0' is not supported for classes "
-    "because of inheritance.",
+    "automatic synthesis of '%0' is not supported for classes",
     (StringRef))
 
 // Dynamic Self