Clean up text, scope initOverride

Author: tmquinn

guides/rules/no-broken-super-chain.md

@@ -2,7 +2,7 @@
 
 ## Rule name: `no-broken-super-chain`
 
-If you are overriding the `init` lifecycle hook in Ember modules like Component, Mixin, etc. it is necessary that you include a call to `_super`
+If you are overriding the `init` lifecycle hook in Ember classes like Component, Mixin, etc. it is necessary that you include a call to `_super`.
 
 ```javascript
 // GOOD

lib/rules/no-broken-super-chain.js

@@ -4,7 +4,7 @@
  */
 
 const MESSAGES = {
-  noSuper: '\'this._super(...arguments)\' must be called in init in this Ember modules',
+  noSuper: '\'this._super(...arguments)\' must be called in init()',
   noThisBeforeSuper: 'Must call \'this._super(...arguments)\' before accessing `this`',
   tooManySupers: 'Only call `this._super(...arguments)` once per init()'
 };
@@ -18,8 +18,6 @@ const EMBER_MODULES_WITH_SUPER_CHAIN = {
   View: true
 };
 
-let initOverride = null;
-
 /**
  * Determines if this is an init method in an extension of Ember[EMBER_MODULES_WITH_SUPER_CHAIN.*]
  * @param {Node} node
@@ -51,6 +49,8 @@ module.exports = {
     messages: MESSAGES
   },
   create(context) {
+    let initOverride = null;
+
     return {
       onCodePathStart(codePath, node) {
         if (isInit(node)) {