Man pages matching name curlopt_resolver_start_data in section 3:

CURLOPT_RESOLVER_START_DATA.3.en	debian 10 / libcurl4-doc
CURLOPT_RESOLVER_START_DATA.3.en	debian 11 / libcurl4-doc
CURLOPT_RESOLVER_START_DATA.3.en	debian 12 / libcurl4-doc