Man pages matching name krb5_get_credentials in section 3:

krb5_get_credentials.3.en	debian 10 / heimdal-dev
krb5_get_credentials.3.en	debian 11 / heimdal-dev
krb5_get_credentials.3.en	debian 12 / heimdal-dev
krb5_get_credentials.3.en	debian 13 / heimdal-dev