docs: update link to ZTunnel doc to address correct file

[zmiklank]

• Documentation Update

[istio-testing]

Hi @zmiklank. Thanks for your PR.

I'm waiting for a istio-ecosystem or istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.48%. Comparing base (beff729) to head (ee4ebff).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1291   +/-   ##
=======================================
  Coverage   77.48%   77.48%           
=======================================
  Files          44       44           
  Lines        2834     2834           
=======================================
  Hits         2196     2196           
+ Misses        529      528    -1     
- Partials      109      110    +1     

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[FilipB]

/ok-to-test