Man pages matching name curlmopt_chunk_length_penalty_size in section 3:

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