copr: modify is_prefix_next fn comment (#6301)
copr: modify is_prefix_next fn comment (#6301)

Signed-off-by: Rustin-Liu <c7d168847ad25898cad3ce2d480246882ded574b@gmail.com>
c4pt0r/tikv,BusyJay/tikv,BusyJay/tikv,pingcap/tikv,BusyJay/tikv,BusyJay/tikv,pingcap/tikv