Doc: Fix double words in Documentation

This patch fix some double words found in Documentation.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/networking/kcm.txt b/Documentation/networking/kcm.txt
index 3476ede..9a51329 100644
--- a/Documentation/networking/kcm.txt
+++ b/Documentation/networking/kcm.txt
@@ -272,7 +272,7 @@
 sees the error (which may just be a disconnect) it should unattach the
 socket from KCM and then close it. It is assumed that once an error is
 posted on the TCP socket the data stream is unrecoverable (i.e. an error
-may have occurred in in the middle of receiving a messssge).
+may have occurred in the middle of receiving a messssge).
 
 TCP connection monitoring
 -------------------------