Update event-loop.md

Event Loop code example fix

Author: wells-x

docs/core-modules/executable-code-and-execution-contexts/concurrency-model/event-loop.md

@@ -56,7 +56,7 @@ setTimeout(() => {
   console.log(2);
 }, 0);
 
-let promise = new Promise((res) => {
+let promise = new Promise((resolve) => {
   console.log(3);
   resolve();
 })