InlineEntityFormBase::getEntityTypeLabels() has the wrong docblock

See InlineEntityFormBase::getEntityTypeLabels().

  /**
   * Gets the entity type managed by this handler.
   *
   * @return \Drupal\Core\Entity\EntityTypeInterface
   *   The entity type.
   */
  protected function getEntityTypeLabels() {
    // The admin has specified the exact labels that should be used.
    if ($this->getSetting('override_labels')) {
      return [
        'singular' => $this->getSetting('label_singular'),
        'plural' => $this->getSetting('label_plural'),
      ];
    }
    else {
      $this->createInlineFormHandler();
      return $this->inlineFormHandler->getEntityTypeLabels();
    }
  }

I was studying the code related to #3149783: Remove hardcoded word 'entities' in EntityInlineForm::getEntityTypeLabels() when I noticed that the return type of this docblock is wrong. Then I noticed that it's just completely unrelated. I'm kind of surprised that PHPStan didn't pick up on this. It found other incorrect return types at level 1.

Anyone attempting to patch this should probably check the other functions in the class for the same problem. Maybe some docblocks accidentally got swapped or something.