docs: use shorthand property name in example (#16180)

The text that introduces the config example says "you can also shorten the configuration to this", but in the config example that follows nothing is shorter than in the previous config example. This commit fixes the config example by using a shorthand property name for jsdoc.

docs/src/user-guide/configuring/configuration-files-new.md

@@ -360,7 +360,7 @@ export default [
     {
         files: ["**/*.js"],
         plugins: {
-            jsdoc: jsdoc
+            jsdoc
         }
         rules: {
             "jsdoc/require-description": "error",