Update for installations with mTLS auth enabled

[kenthua]

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-testing]

Hi @kenthua. Thanks for your PR.

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[geeknoid]

Deploy preview for preliminary-istio failed.

Built with commit 7b564b0

https://app.netlify.com/sites/preliminary-istio/deploys/5b202423b312740eb058da8f

[geeknoid]

/lgtm

[istio-testing]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: geeknoid, kenthua

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[kenthua]

I'm using the same URI's as noted in the mirroring doc and other docs. But the netlify keeps failing.

12:56:12 PM: - ./public/docs/tasks/traffic-management/mirroring/index.html
12:56:12 PM:   *  linking to /docs/reference/config/istio.networking.v1alpha3/#TLSSettings.TLSmode, but TLSSettings.TLSmode does not exist (line 104)
12:56:12 PM:      <a href="/docs/reference/config/istio.networking.v1alpha3/#TLSSettings.TLSmode">TLSSettings.TLSmode</a>
12:56:12 PM: htmlproofer 3.9.1 | Error:  HTML-Proofer found 1 failure!
12:56:12 PM: make: *** [lint] Error 1

[geeknoid]

If you sync your tree, you will see that these URLs have been updated recently. The right path is now:

/docs/reference/config/istio.networking.v1alpha3/#TLSSettings-TLSmode

[istio-testing]

New changes are detected. LGTM label has been removed.