Doc: Fix typos in ip-sysctl.txt about rp_filter.

First fix a typo in Stephens patch ;-)

Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 71041c2..e0b8c2c 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -711,8 +711,8 @@
 	    the packet check will fail.
 
         Current recommended practice in RFC3704 is to enable strict mode
-	to prevent IP spoofin from DDos attacks. If using asymmetric routing
-        or other complicated routing,t hen loose mode is recommended.
+	to prevent IP spoofing from DDos attacks. If using asymmetric routing
+        or other complicated routing, then loose mode is recommended.
 
 	conf/all/rp_filter must also be set to non-zero to do source validation
 	on the interface