update existing field wording

docs/en/serverless/logging/add-logs-service-name.mdx

@@ -36,7 +36,7 @@ For more on defining processors, refer to [define processors](((fleet-guide))/el
 
 ## Map an existing field to the service name field
 
-For logs that already have the field to use as the service name, map that field to the `service.name` field using the [alias field type](((ref))/field-alias.html).
+For logs that with an existing field being used to represent the service name, map that field to the `service.name` field using the [alias field type](((ref))/field-alias.html).
 Follow these steps to update your mapping:
 
 1. Go to **Management** → **Index Management** → **Index Templates**.