include /mcp in note about reserved paths (#973)

Author: ethanpalm

navigation.mdx

@@ -9,7 +9,7 @@ The [navigation](settings#param-navigation) property in [docs.json](settings) de
 With proper navigation configuration, you can organize your content into a logical hierarchy that makes it easy for users to find exactly what they're looking for.
 
 <Info>
-  Do not use `api` as a title for any navigation element. The `/api` path is reserved in production and will cause pages to return 404 errors if their URLs contain `/api`.
+  Do not use `api` or `mcp` as titles for any navigation element. The `/api` and `/mcp` paths are reserved in production and will cause pages to return 404 errors if their URLs contain `/api` or `/mcp`.
 </Info>
 
 ## Pages