docs: fix grammar in oauth usage steps (#287)

Fixes minor grammatical issues in final oauth usage steps.

Signed-off-by: Daniel Mangum <[email protected]>

Author: hasheddan

docs/OAUTH_SUPPORT.md

@@ -70,7 +70,7 @@ rmcp = { version = "0.1", features = ["auth", "transport-sse-client"] }
     let client = client_service.serve(transport).await?;
 ```
 
-### 5. May you can use Authorized HTTP Client after authorized
+### 5. Use Authorized HTTP Client after authorized
 
 ```rust ignore
     let client = oauth_state.to_authorized_http_client().await?;
@@ -122,4 +122,4 @@ If you encounter authorization issues, check the following:
 - [MCP Authorization Specification](https://spec.modelcontextprotocol.io/specification/2025-03-26/basic/authorization/)
 - [OAuth 2.1 Specification Draft](https://oauth.net/2.1/)
 - [RFC 8414: OAuth 2.0 Authorization Server Metadata](https://datatracker.ietf.org/doc/html/rfc8414)
-- [RFC 7591: OAuth 2.0 Dynamic Client Registration Protocol](https://datatracker.ietf.org/doc/html/rfc7591) 
+- [RFC 7591: OAuth 2.0 Dynamic Client Registration Protocol](https://datatracker.ietf.org/doc/html/rfc7591)