Remove capacity from JsonDocument's constructor

examples/JsonServer/JsonServer.ino

@@ -58,7 +58,7 @@ void loop() {
 
   // Allocate a temporary JsonDocument
   // Use https://arduinojson.org/v6/assistant to compute the capacity.
-  JsonDocument doc(500);
+  JsonDocument doc;
 
   // Create the "analog" array
   JsonArray analogValues = doc.createNestedArray("analog");