Fix link to MCP Authorization specification

Updated link in security best practices document, removing the "mdx".

Author: pamelafox

docs/specification/2025-11-25/basic/security_best_practices.mdx

@@ -8,7 +8,7 @@ title: Security Best Practices
 
 ### Purpose and Scope
 
-This document provides security considerations for the Model Context Protocol (MCP), complementing the [MCP Authorization](../basic/authorization.mdx) specification. This document identifies security risks, attack vectors, and best practices specific to MCP implementations.
+This document provides security considerations for the Model Context Protocol (MCP), complementing the [MCP Authorization](../basic/authorization) specification. This document identifies security risks, attack vectors, and best practices specific to MCP implementations.
 
 The primary audience for this document includes developers implementing MCP authorization flows, MCP server operators, and security professionals evaluating MCP-based systems. This document should be read alongside the MCP Authorization specification and [OAuth 2.0 security best practices](https://datatracker.ietf.org/doc/html/rfc9700).