Docs: Remove redundant syntax from callable type declarations.

The parameter name is optional in PHPStan but not supported by Psalm. While neither tools are officially supported, this removes the parse error that Psalm users otherwise see.

See php-stubs/wordpress-stubs#410 for some external discussion.

Props farhad0, marian1

See #64224


git-svn-id: https://develop.svn.wordpress.org/trunk@61505 602fd350-edb4-49c9-b593-d223f7449a82

Author: johnbillion

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

@@ -103,15 +103,15 @@ class WP_Ability {
 	 * The ability execute callback.
 	 *
 	 * @since 6.9.0
-	 * @var callable( mixed $input= ): (mixed|WP_Error)
+	 * @var callable(mixed): (mixed|WP_Error)
 	 */
 	protected $execute_callback;
 
 	/**
 	 * The optional ability permission callback.
 	 *
 	 * @since 6.9.0
-	 * @var callable( mixed $input= ): (bool|WP_Error)
+	 * @var callable(mixed): (bool|WP_Error)
 	 */
 	protected $permission_callback;