man/io_uring_enter.2: correct IORING_OP_SHUTDOWN description
We do take 2 arguments, both fd and how. Make sure the man page is
correct.
Fixes:
@@ -896,8 +896,11 @@ Issue the equivalent of a
.BR shutdown(2)
system call.
.I fd
-is the file descriptor to the socket being shutdown, no other fields should
-be set. Available since 5.11.
+is the file descriptor to the socket being shutdown, and
+.I len
+must be set to the
+.I how
+argument. No no other fields should be set. Available since 5.11.
.TP
.B IORING_OP_RENAMEAT
