Fix JSON example in /config docs

The JSON example has an extra closing brace, causing the JSON to be invalid. The fix is to remove the stray closing brace.

docs/local-server.md

@@ -109,7 +109,6 @@ Compensated values apply correction algorithms to make the sensor values more ac
     }
   }
 }
-}
 ```
 
 ### Set Configuration Parameters (PUT)