Man pages matching name xkbsetbouncekeysdelay in section 3:

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