Document non-blocking API of MariaDB Connector/C

I see that MariaDB Connector/C's non-blocking API is mentioned in the following places:

https://mariadb.com/kb/en/mariadb/non-blocking-client-library/ (although it incorrectly says MySQL Connector/C instead of MariaDB Connector/C)

https://mariadb.com/kb/en/mariadb/mariadb-connector-c-210-release-notes/

However, I do not see any documentation pages about the non-blocking API anywhere in the MariaDB Connector/C documentation shown here:

https://mariadb.com/kb/en/mariadb/mariadb-connector-c/

I do not see pages for mysql_real_query_start or mysql_real_query_cont here:

https://mariadb.com/kb/en/mariadb/mariadb-connectorc-api-functions/

I also do not see MYSQL_OPT_NONBLOCK here:

https://mariadb.com/kb/en/mariadb/mysql_optionsv/