Man pages matching name sd_bus_error_name_has_no_owner in section 3:

SD_BUS_ERROR_NAME_HAS_NO_OWNER.3.en	debian 10 / libsystemd-dev
SD_BUS_ERROR_NAME_HAS_NO_OWNER.3.en	debian 11 / libsystemd-dev
SD_BUS_ERROR_NAME_HAS_NO_OWNER.3.en	debian 12 / libsystemd-dev