Docs: Add plugin example to disabling with comments guide (fixes #6742)…

… (#6747)

docs/user-guide/configuring.md

@@ -415,6 +415,12 @@ alert('foo'); // eslint-disable-line no-alert, quotes, semi
 alert('foo');
 ```
 
+All of the above methods also work for plugin rules. For example, to disable `eslint-plugin-example`'s `rule-name` rule, combine the plugin's name (`example`) and the rule's name (`rule-name`) into `example/rule-name`:
+
+```js
+foo(); // eslint-disable-line example/rule-name
+```
+
 **Note:** Comments that disable warnings for a portion of a file tell ESLint not to report rule violations for the disabled code. ESLint still parses the entire file, however, so disabled code still needs to be syntactically valid JavaScript.
 
 ## Adding Shared Settings