[XFRM] Documentaion: Fix error example at XFRMOUTSTATEMODEERROR.

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/xfrm_proc.txt

@@ -60,7 +60,6 @@ XfrmOutStateProtoError:
 	Transformation protocol specific error
 XfrmOutStateModeError:
 	Transformation mode specific error
-	e.g. Outer header space is not enough
 XfrmOutStateExpired:
 	State is expired
 XfrmOutPolBlock: