FIX: PHPDoc wrong return value (#30634)

* FIX: PHPDoc wrong return value

* better type

* FIX: there is more types for Categorie::containing() return

htdocs/core/class/commonobject.class.php

@@ -10857,7 +10857,7 @@ abstract class CommonObject
 	 * Existing categories are left untouch.
 	 *
 	 * @param 	string 		$type_categ 	Category type ('customer', 'supplier', 'website_page', ...)
-	 * @return	int							Array of category objects or < 0 if KO
+	 * @return	int[]|int					Array of category IDs or < 0 if KO
 	 */
 	public function getCategoriesCommon($type_categ)
 	{