Update include/swift/AST/DiagnosticsFrontend.def

Author: elsh

include/swift/AST/DiagnosticsFrontend.def

@@ -186,8 +186,6 @@ ERROR(error_bad_package_name,none,
 ERROR(error_stdlib_package_name,none,
       "package name \"%0\" is reserved for the standard library",
       (StringRef))
-      "package name \"%0\" should be different from the module name",
-      (StringRef))
 ERROR(error_stdlib_not_found,Fatal,
       "unable to load standard library for target '%0'", (StringRef))
 ERROR(error_module_alias_invalid_format,none,