Remove misspelled and deprecated getComputedAttrib

Author: mrxz

src/core/scene/a-scene.js

@@ -500,15 +500,6 @@ class AScene extends AEntity {
     return AEntity.prototype.getAttribute.call(this, attr);
   }
 
-  /**
-   * `getAttribute` used to be `getDOMAttribute` and `getComputedAttribute` used to be
-   * what `getAttribute` is now. Now legacy code.
-   */
-  getComputedAttribut (attr) {
-    warn('`getComputedAttribute` is deprecated. Use `getAttribute` instead.');
-    this.getAttribute(attr);
-  }
-
   /**
    * Wraps Entity.getDOMAttribute to take into account for systems.
    * If system exists, then return system data rather than possible component data.