Man pages matching name xkbgetbouncekeysdelay in section 3:

XkbGetBounceKeysDelay.3.en	debian 10 / libx11-doc
XkbGetBounceKeysDelay.3.en	debian 11 / libx11-doc
XkbGetBounceKeysDelay.3.en	debian 12 / libx11-doc