Add 'scoped' to f1_keywords for F1 help support (fixes #46245) (#46253)

* Add 'scoped' and 'scoped_CSharpKeyword' to f1_keywords for F1 help support for the scoped modifier (fixes #46245)

* Update declarations.md

Author: yufeih

docs/csharp/language-reference/statements/declarations.md

@@ -5,6 +5,8 @@ ms.date: 06/21/2023
 f1_keywords: 
   - "var"
   - "var_CSharpKeyword"
+  - "scoped"
+  - "scoped_CSharpKeyword"
 helpviewer_keywords: 
   - "var keyword [C#]"
 ---