[patch] io_submit.2: fix the description of aio_data

[Jeff Moyer <jmoyer@xxxxxxxxxx>]

aio_data is not a kernel-internal field.

Signed-off-by: Jeff Moyer <jmoyer@xxxxxxxxxx>

diff --git a/man2/io_submit.2 b/man2/io_submit.2
index c15db3f41..d5253d1cf 100644
--- a/man2/io_submit.2
+++ b/man2/io_submit.2
@@ -59,10 +59,11 @@ struct iocb {
 The fields of this structure are as follows:
 .TP
 .I aio_data
-This is an internal field used by the kernel.
-Do not modify this field after an
-.BR io_submit (2)
-call.
+This data is copied into the
+.I data
+field of the
+.I io_event
+structure upon I/O completion (see io_getevents(2)).
 .TP
 .I aio_key
 This is an internal field used by the kernel.