Man pages matching name xcb_xfixes_selection_notify_event_t in section 3:

xcb_xfixes_selection_notify_event_t.3.en	debian 10 / libxcb-doc
xcb_xfixes_selection_notify_event_t.3.en	debian 11 / libxcb-doc
xcb_xfixes_selection_notify_event_t.3.en	debian 12 / libxcb-doc