refactor: remove legacy designation from OpenID Connect Discovery path appending

Author: xiaoyijun

docs/specification/draft/basic/authorization.mdx

@@ -104,7 +104,7 @@ For issuer URLs with path components (e.g., `https://auth.example.com/tenant1`),
 
 1. OAuth 2.0 Authorization Server Metadata with path insertion: `https://auth.example.com/.well-known/oauth-authorization-server/tenant1`
 2. OpenID Connect Discovery with path insertion: `https://auth.example.com/.well-known/openid-configuration/tenant1`
-3. OpenID Connect Discovery 1.0 legacy path appending: `https://auth.example.com/tenant1/.well-known/openid-configuration`
+3. OpenID Connect Discovery 1.0 path appending: `https://auth.example.com/tenant1/.well-known/openid-configuration`
 
 For issuer URLs without path components (e.g., `https://auth.example.com`), clients **MUST** try: