fix: broken link

Signed-off-by: Logan Blyth <[email protected]>

Author: mrbojangles3

docs/user-guide/external.md

@@ -300,4 +300,4 @@ route-map HedgeOut permit 10
 bgp community-list standard HedgeIn permit 5000:65102
 ```
 
-See [Gateway Peering with NAT for External Connections](gateway.md#gateway-peering-with-nat-for-external-connections) for an examples on how to connect to external networks using NAT.
+See [Gateway Peering with NAT for External Connections](gateway.md#gateway-peering-for-external-connections) for an examples on how to connect to external networks using NAT.