Man pages matching name pkcs5_pbkdf2_hmac in section 3ssl:

PKCS5_PBKDF2_HMAC.3ssl.en	debian 10 / libssl-doc
PKCS5_PBKDF2_HMAC.3ssl.en	debian 11 / libssl-doc
PKCS5_PBKDF2_HMAC.3ssl.en	debian 12 / libssl-doc