[DOC release] Make inline code-samples equivalent

Author: locks

packages/ember-runtime/lib/mixins/observable.js

@@ -164,7 +164,7 @@ export default Mixin.create({
   /**
     Sets the provided key or path to the value.
 
-    This method is generally very similar to calling `object[key] = value` or
+    This method is generally very similar to calling `object["key"] = value` or
     `object.key = value`, except that it provides support for computed
     properties, the `setUnknownProperty()` method and property observers.