docs: Update broken "Multiple Projects" link in README.md (#55)

Author: codeluggage

README.md

@@ -285,7 +285,7 @@ for OS X):
 }
 ```
 
-If you want to use a specific project (see [Multiple Projects](#multiple-projects) below), update your Claude Desktop
+If you want to use a specific project (see [Multiple Projects](docs/User%20Guide.md#multiple-projects)), update your Claude Desktop
 config:
 
 ```json
@@ -361,4 +361,4 @@ and submitting PRs.
  </picture>
 </a>
 
-Built with ♥️ by Basic Machines
+Built with ♥️ by Basic Machines