* Returns the name of the main property, if any.
*
* Some field items consist mainly of one main property, e.g. the value of a
- * text field or the @code target_id @endcode of an entity reference. If the
- * field item has no main property, the method returns NULL.
+ * text field or the target_id of an entity reference. If the field item has
+ * no main property, the method returns NULL.
*
* @return string|null
* The name of the value property, or NULL if there is none.