fix missing sample link

Author: maxandersen

_posts/2025-01-13-mcp-server.adoc

@@ -57,7 +57,7 @@ We're using the `stdio` variant as it's required for MCP hosts that run the serv
 
 == Building the server
 
-Create a new file `src/main/java/org/acme/Weather.java`. The complete code for this example is available here: [].
+Create a new file `src/main/java/org/acme/Weather.java`. The complete code for this example is available https://github.com/quarkiverse/quarkus-mcp-server/tree/main/samples/weather[here].
 
 === Weather API Integration