Updates the amount of terms in taxonomy.
If there is a taxonomy callback applied, then it will be called for updating the count.
The default action is to count what the amount of terms have the relationship of term ID. Once that is done, then update the database.
(int|array) (Required) The term_taxonomy_id of the terms.
(string) (Required) The context of the term.
(bool) (Optional) Whether to flush the deferred term counts too.
Default value: false
(bool) If no terms will return false, and if successful will return true.