Update 3.registering-abilities.md

docs/3.registering-abilities.md

@@ -10,7 +10,7 @@ wp_register_ability( string $id, array $args ): ?\WP_Ability
 
 -   `$id` (`string`): A unique identifier for the ability.
 -   `$args` (`array`): An array of arguments defining the ability configuration.
--   **Return:** (`?\WP_Ability`) An instance of the registered ability if the it was successfully registered, `null` on failure (e.g., invalid arguments, duplicate ID).
+-   **Return:** (`?\WP_Ability`) An instance of the registered ability if it was successfully registered, `null` on failure (e.g., invalid arguments, duplicate ID).
 
 **Parameters Explained**