Man pages matching name curlinfo_tls_ssl_ptr in section 3:

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