Issue #3417521 by jayhuskins: Update typing for plugin definition to include object

(cherry picked from commit ed6f70f8)

core/lib/Drupal/Component/Plugin/PluginBase.php

@@ -22,7 +22,7 @@ abstract class PluginBase implements PluginInspectionInterface, DerivativeInspec
   /**
    * The plugin implementation definition.
    *
-   * @var array
+   * @var \Drupal\Component\Plugin\Definition\PluginDefinitionInterface|array
    */
   protected $pluginDefinition;
 

core/lib/Drupal/Component/Plugin/PluginInspectionInterface.php

@@ -23,7 +23,7 @@ public function getPluginId();
   /**
    * Gets the definition of the plugin implementation.
    *
-   * @return array
+   * @return \Drupal\Component\Plugin\Definition\PluginDefinitionInterface|array
    *   The plugin definition, as returned by the discovery object used by the
    *   plugin manager.
    */