Update OAuth references to use consistent "OAuth 2.0" terminology

Revised instances of "OAuth2" to "OAuth 2.0" for clarity and consistency with industry standards. This improves accuracy in documentation and aligns terminology across all references.

Author: khalidabuhakmeh

src/content/docs/bff/index.mdx

@@ -75,7 +75,7 @@ It offers the following functionality:
 
 - Protection from Token Extraction attacks
 - Built-in CSRF Attack protection
-- Server Side OAuth2 Authentication
+- Server Side OAuth 2.0 Support
 - User Management APIs
 - Back-channel logout
 - Securing access to both local and external APIs by serving as a reverse proxy.

src/content/docs/identitymodel/utils/request-url.md

@@ -1,6 +1,6 @@
 ---
 title: Creating Authorize and EndSession URLs
-description: Helper utilities for creating OAuth2/OpenID Connect authorization and end session URLs with query parameters
+description: Helper utilities for creating OAuth 2.0/OpenID Connect authorization and end session URLs with query parameters
 sidebar:
   order: 4
   label: Authorize & EndSession URLs