Update for installations with mTLS auth enabled (#1503)

* Update for installations with mTLS auth enabled The docs do not provide reference to installations with mTLS auth enabled. If mTLS auth is enabled and the user goes through the instructions, they will encounter `upstream connect error or disconnect/reset before headers` when the DestinationRule is applied. istio/old_issues_repo#375 (comment) helped lead to the resolution.
istio · Jun 14, 2018 · 7874083 · 7874083
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commit 7874083
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diff --git a/content/docs/tasks/traffic-management/mirroring.md b/content/docs/tasks/traffic-management/mirroring.md
@@ -152,6 +152,8 @@ Let's set up a scenario to demonstrate the traffic-mirroring capabilities of Ist
         EOF
     ```
 
+    > NOTE: If you installed/configured istio with mTLS Authentication enabled, you must add the [TLSSettings.TLSmode]( /docs/reference/config/istio.networking.v1alpha3/#TLSSettings-TLSmode), `mode: ISTIO_MUTUAL` as noted in the [TLSSettings](/docs/reference/config/istio.networking.v1alpha3/#TLSSettings) reference.
+
     Now all traffic should go to `httpbin v1` service. Let's try sending in some traffic:
 
     ```command-output-as-json