l7 logging: Clarify that it must be the Calico specific istio

Author: alexh-tigera

calico-enterprise/observability/elastic/l7/enable-waypoint-collector.mdx

@@ -8,7 +8,7 @@ Enable the Istio Ambient Mode Waypoint-based L7 collector to capture HTTP/1, HTT
 
 ## Prerequisites
 
-- A workload running in an [Istio Service Mesh](../../../compliance/istio/deploy-istio-ambient.mdx).
+- A workload running in Calico's bundled [Istio Service Mesh](../../../compliance/istio/deploy-istio-ambient.mdx).
 
 ## Enable the collector