docs(codepen): add missing space in module declaration (#11095)

was `module('MyApp',['ngMaterial',`
now `module('MyApp', ['ngMaterial',`

Author: Splaktar

docs/app/js/codepen.js

@@ -206,7 +206,7 @@
 
       // See scripts.js for list of external AngularJS libraries used for the demos
 
-      return file.replace(matchAngularModule, ".module('MyApp',"+ modules + ")");
+      return file.replace(matchAngularModule, ".module('MyApp', "+ modules + ")");
     }
   }
 })();