Man pages matching name xcb_xkb_use_extension in section 3:

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