man/io_uring_submit_and_wait_timeout.3: fix return value description
Fixes:
@@ -38,10 +38,14 @@ After the caller retrieves a submission queue entry (SQE) with
and prepares the SQE, it can be submitted with
.BR io_uring_submit_and_wait_timeout (3) .
+Unlike the other submit functions, this does not return the number of submitted entries.
+The actual number submitted can be less than the total number of ready SQEs if there
+was an error submitting an SQE. It is not an error to submit less than the total number of SQEs.
+
.SH RETURN VALUE
On success
.BR io_uring_submit_and_wait_timeout (3)
-returns the number of submitted submission queue entries. On failure it returns
+returns 0 and the cqe_ptr param is filled in. On failure it returns
.BR -errno .
The most common failure case is not receiving a completion within the specified
timeout,
