Document jQuery.isEmptyObject doesn't take symbols into account

Description

On version 3.6.0, I found a vulnerability，I find that the method of detecting empty objects is not perfect.

isEmptyObject: function( obj ) {
  var name;

  for ( name in obj ) {
     return false;
   }
   return true;
},

The downside of writing this is that the properties of the prototype chain and the Symbol type are not taken into account，I have a better way to implement it as follows.

isEmptyObject: function( obj ) {
    var keys = Object.keys(obj);

    // 看浏览器是否支持 Symbol
    if (typeof Symbol !== "undefined") {
       keys = keys.concat(Object.getOwnPropertySymbols(obj));
    }
  
    return keys.length === 0;
}

Link to test case

This direct modification of the source code test is good, I do not have a service to run this test. I'm looking forward to hearing from you.

Start by locating the jQuery.isEmptyObject API documentation and compare its current description with the behavior described in the issue. Confirm whether the documentation should explain Symbol properties and prototype-chain properties, then update the relevant documentation and verify the rendered entry reflects the agreed behavior.