Add doc explaining how to generate blacklist array

Author: nlfurniss

guides/rules/no-jquery-methods.md

@@ -2,12 +2,12 @@
 
 **TL;DR** The intent of this rule is to identify any blacklisted jQuery methods as deprecated.
 
-Provides the ability to blacklist a set of jQuery methods for deprecation. 
+Provides the ability to blacklist a set of jQuery methods for deprecation.
 The eventual goal being a complete removal of jQuery.
 
 # Usage
 
-Pass an argument array containing the specific blacklisted jQuery methods your consuming application is flagging for. 
+Pass an argument array containing the specific blacklisted jQuery methods your consuming application is flagging for.
 
 ```js
 const BLACKLIST = [
@@ -21,3 +21,9 @@ rules: {
   'ember-best-practices/no-jquery-methods': ['error', BLACKLIST]
 }
 ```
+To help generate this blacklist array, you can run this snippet in the console of your app:
+```js
+// In the dev tools console of your app.
+let $methods = [...new Set(Object.keys($).concat(Object.keys($.fn)))];
+copy(`'${$methods.join('\',\r\n\'')}'`)
+```