[clang][NFC] Add missing 'override's

Author: kepler-5

clang/lib/Tooling/Refactoring/RefactoringActions.cpp

@@ -18,8 +18,8 @@ namespace {
 
 class DeclNameOption final : public OptionalRefactoringOption<std::string> {
 public:
-  StringRef getName() const { return "name"; }
-  StringRef getDescription() const {
+  StringRef getName() const override { return "name"; }
+  StringRef getDescription() const override {
     return "Name of the extracted declaration";
   }
 };