Issue #3490042 by tr: Typing updates

Closes #3490042

src/Core/RulesConfigurableEventHandlerInterface.php

@@ -47,7 +47,7 @@ interface RulesConfigurableEventHandlerInterface extends RulesEventHandlerInterf
   /**
    * Provides a human readable summary of the event's configuration.
    *
-   * @return string|\Drupal\Component\Render\MarkupInterface
+   * @return string
    *   The human readable summary.
    */
   public function summary();
@@ -63,7 +63,7 @@ interface RulesConfigurableEventHandlerInterface extends RulesEventHandlerInterf
    * @return array
    *   The form structure.
    */
-  public function buildConfigurationForm(array $form, FormStateInterface $form_state);
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state): array;
 
   /**
    * Extract the form values and update the event configuration.
@@ -91,9 +91,9 @@ interface RulesConfigurableEventHandlerInterface extends RulesEventHandlerInterf
    * uses for the configured event is {EVENT_NAME}--{SUFFIX}.
    *
    * @return string|false
-   *   The suffix string, for FALSE if no suffix should be appended.
+   *   The suffix string, or FALSE if no suffix should be appended.
    */
-  public function getEventNameSuffix();
+  public function getEventNameSuffix(): string|false;
 
   /**
    * Refines provided context definitions based upon plugin configuration.