Man pages matching name mongoc_session_opts_set_causal_consistency in section 3:

mongoc_session_opts_set_causal_consistency.3.en	debian 10 / libmongoc-doc
mongoc_session_opts_set_causal_consistency.3.en	debian 11 / libmongoc-doc
mongoc_session_opts_set_causal_consistency.3.en	debian 12 / libmongoc-doc