fix: disable_studio_auth type (#1188)

Author: hinthornw

src/langsmith/set-up-custom-auth.mdx

@@ -142,13 +142,13 @@ Start the server again to test everything out:
 langgraph dev --no-browser
 ```
 
-If you didn't add the `--no-browser`, the Studio UI will open in the browser. By default, we also permit access from Studio, even when using custom auth. This makes it easier to develop and test your bot in Studio. You can remove this alternative authentication option by setting `disable_studio_auth: "true"` in your auth configuration:
+If you didn't add the `--no-browser`, the Studio UI will open in the browser. By default, we also permit access from Studio, even when using custom auth. This makes it easier to develop and test your bot in Studio. You can remove this alternative authentication option by setting `disable_studio_auth: true` in your auth configuration:
 
 ```json
 {
     "auth": {
         "path": "src/security/auth.py:auth",
-        "disable_studio_auth": "true"
+        "disable_studio_auth": true
     }
 }
 ```