Fix typo in the link (elastic#138804)

Author: gbamparop

docs/reference/enrich-processor/network-direction-processor.md

@@ -9,7 +9,7 @@ mapped_pages:
 
 Calculates the network direction given a source IP address, destination IP address, and a list of internal networks.
 
-The network direction processor reads IP addresses from [Elastic Common Schema (ECS)][Elastic Common Schema (ECS)](ecs://reference/index.md)) fields by default. If you use the ECS, only the `internal_networks` option must be specified.
+The network direction processor reads IP addresses from [Elastic Common Schema (ECS)](ecs://reference/index.md) fields by default. If you use the ECS, only the `internal_networks` option must be specified.
 
 $$$network-direction-options$$$