man/io_uring_buf_ring_cq_advance.3: Fix return type
man/io_uring_buf_ring_cq_advance.3: Fix return type

This function doesn't return anything, the return type should be void.

Fixes: f01ed8b0037457ff845adecb39a01540eaa332c0 ("Add man pages for shared provided buffer rings")
Signed-off-by: Alviro Iskandar Setiawan <acb00eee907e465a4ea2ca150e2639c8348f1d28@gnuweeb.org>
Signed-off-by: Ammar Faizi <a8266392a329a5c7b5ab982a8996391d75b6438e@gnuweeb.org>

axboe/liburing,axboe/liburing,axboe/liburing