docs: add correct example

docs/src/rules/no-implicit-globals.md

@@ -260,6 +260,16 @@ window.MyGlobalFunction = (function() {
 
 You can use `/* exported variableName */` block comments in the same way as in [`no-unused-vars`](./no-unused-vars). See the [`no-unused-vars` exported section](./no-unused-vars#exported) for details.
 
+Examples of **correct** code for `/* exported variableName */` operation:
+
+::: correct
+
+```js
+/* exported global_var */
+
+var global_var = 42;
+```
+
 ## When Not To Use It
 
 In the case of a browser script, if you want to be able to explicitly declare variables and functions in the global scope,