Cleanup markdown sample code (#40)

* Use const/let in sample code

* run eslint on markdown code

* run eslint on markdown code

doc/can-globals.md

@@ -11,20 +11,20 @@
 methods used to set and get global variables. For example, get the global [`location`](https://developer.mozilla.org/en-US/docs/Web/API/Window/location) object:
 
 ```js
-const globals = require('can-globals');
+import globals from "can-globals";
 
-const LOCATION = globals.getKeyValue('location');
+const LOCATION = globals.getKeyValue( "location" );
 ```
 
 New keys can be defined with the `define` method, overwritten with the `set` method, and reset to their original value with the `reset` method.
 All of these methods are demonstrated in the following example
 
 ```js
-const globals = require('can-globals');
+import globals from "can-globals";
 
-globals.define('foo', 'bar'); // foo === 'bar'
+globals.define( "foo", "bar" ); // foo === 'bar'
 
-globals.set('foo', 'baz'); // foo === 'baz'
+globals.set( "foo", "baz" ); // foo === 'baz'
 
-globals.reset('foo'); // foo === 'bar'
+globals.reset( "foo" ); // foo === 'bar'
 ```