Patch for TCP_USER_TIMEOUT in tcp.7

[Enke Chen <enchen@xxxxxxxxxxxxxxxxxxxx>]

diff --git a/man7/tcp.7 b/man7/tcp.7
index 82de9a2c7..94d26c3bb 100644
--- a/man7/tcp.7
+++ b/man7/tcp.7
@@ -1206,7 +1206,7 @@ corresponding connection and return
 .B ETIMEDOUT
 to the application.
 If the option value is specified as 0,
-TCP will use the system default.
+the option will be disabled.
 .IP
 Increasing user timeouts allows a TCP connection to survive extended
 periods without end-to-end connectivity.