Fix: Add missing category to show_in_rest test abilities

Fixes test failures after merging trunk by adding the required `category` field to `test/not-show-in-rest` abilities. These abilities were introduced in PR WordPress#103 (show_in_rest feature) on trunk before the category requirement existed.

Also fixes code bugs issues in WP_Ability class:
- Add missing PHPDoc comment opener for show_in_rest property
- Add missing PHPDoc comment opener for show_in_rest() method
- Remove extra blank line in validate_args()

Author: galatanovidiu

includes/abilities-api/class-wp-ability.php

@@ -124,6 +124,7 @@ class WP_Ability {
 	 */
 	protected $category;
 
+	/**
 	 * Whether to show the ability in the REST API.
 	 *
 	 * @since n.e.x.t
@@ -272,7 +273,6 @@ protected function prepare_properties( array $args ): array {
 			);
 		}
 
-
 		// Set defaults for optional args.
 		$args['annotations'] = wp_parse_args(
 			$args['annotations'] ?? array(),
@@ -371,6 +371,7 @@ public function get_category(): string {
 		return $this->category;
 	}
 
+	/**
 	 * Checks whether the ability should be shown in the REST API.
 	 *
 	 * @since n.e.x.t

tests/unit/rest-api/wpRestAbilitiesListController.php

@@ -225,6 +225,7 @@ private function register_test_abilities(): void {
 			array(
 				'label'               => 'Hidden from REST',
 				'description'         => 'It does not show in REST.',
+				'category'            => 'general',
 				'execute_callback'    => static function (): int {
 					return 0;
 				},

tests/unit/rest-api/wpRestAbilitiesRunController.php

@@ -249,6 +249,7 @@ private function register_test_abilities(): void {
 			array(
 				'label'               => 'Hidden from REST',
 				'description'         => 'It does not show in REST.',
+				'category'            => 'general',
 				'execute_callback'    => static function (): int {
 					return 0;
 				},