man: fix SYNOPSIS of `io_uring_register_sync_cancel`
@@ -9,7 +9,7 @@ io_uring_register_sync_cancel \- issue a synchronous cancelation request
.nf
.B #include <liburing.h>
.PP
-.BI "int io_uring_register_buffers(struct io_uring *" ring ",
+.BI "int io_uring_register_sync_cancel(struct io_uring *" ring ",
.BI " struct io_uring_sync_cancel_reg *" reg ");
.PP
.SH DESCRIPTION
