Update authorization.mdx

Author: localden

docs/specification/draft/basic/authorization.mdx

@@ -361,7 +361,7 @@ MCP servers **MUST** validate access tokens before processing the request, ensur
 
 A MCP server **MUST** follow the guidelines in [OAuth 2.1 - Section 5.2](https://www.ietf.org/archive/id/draft-ietf-oauth-v2-1-12.html#section-5.2) to validate inbound tokens.
 
-MCP servers **MUST** only accept tokens specifically intended for themselves and **MUST** reject tokens that do not include them in the audience claim or otherwise verify that they are the intended recipient of the token. See [Security Best Practices](../security_best_practices) for details.
+MCP servers **MUST** only accept tokens specifically intended for themselves and **MUST** reject tokens that do not include them in the audience claim or otherwise verify that they are the intended recipient of the token. See [Security Best Practices Section 2.2](/specification/draft/basic/security_best_practices#token-passthrough) for details.
 
 If the MCP server makes requests to upstream APIs, it may act as an OAuth client to them. The access token used at the upstream API is a seperate token, issued by the upstream authorization server. The MCP server **MUST NOT** pass through the token it received from the MCP client.