Backport of Add envoy extension docs into release/1.15.x #16394
Merged
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Backport
This PR is auto-generated from #16376 to be assessed for backporting due to the inclusion of the label backport/1.15.
WARNING automatic cherry-pick of commits failed. Commits will require human attention.
The below text is copied from the body of the original PR.
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Testing & Reproduction steps
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