[PATCH] unix.7: Add a description for ENFILE.

[Kuniyuki Iwashima <kuniyu@amazon.co.jp>]

When creating UNIX domain sockets, the kernel used to return -ENOMEM on
error where it should return -ENFILE.  The behaviour has been wrong since
2.2.4 and fixed in the recent commit f4bd73b5a950 ("af_unix: Return errno
instead of NULL in unix_create1().").

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
---
Note to maintainers of man-pages, the commit is merged in the net tree [0]
but not in the Linus' tree yet.

[0]: https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=f4bd73b5a950
---
 man7/unix.7 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/man7/unix.7 b/man7/unix.7
index 6d30b25cd..2dc96fea1 100644
--- a/man7/unix.7
+++ b/man7/unix.7
@@ -721,6 +721,9 @@ invalid state for the applied operation.
 called on an already connected socket or a target address was
 specified on a connected socket.
 .TP
+.B ENFILE
+The system-wide limit on the total number of open files has been reached.
+.TP
 .B ENOENT
 The pathname in the remote address specified to
 .BR connect (2)
-- 
2.30.2