Fix sample code in HTML reference docs

[esimons]

Updating cookie matcher example to align with testdata: https://github.com/istio/istio/blob/master/tests/testdata/config/virtual-service-all.yaml#L18

Pasting here since diff is too big for preview:

  http:
  - match:
    - headers:
        cookie:
-         user: dev-123
+         regex: "^(.*?;)?(user=dev-123)(;.*)?"

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[istio-testing]

Hi @esimons. Thanks for your PR.

I'm waiting for a 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.

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[venilnoronha]

You need to make the changes in the proto file and then generate this html using make commands.

[esimons]

@venilnoronha it doesn't appear that this is a generated file. As a sanity check, I just did a project search for what's being replaced and came up empty.

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[venilnoronha]

It's probably being generated from the following line.

api/networking/v1alpha3/gateway.proto

Line 120 in f5ccf50

// exact: "user=dev-123"

[esimons]

After doing a bit of digging, it seems like this file should actually be deleted entirely following #811, since it's no longer generated via makefile and appears to have been broken down into multiple pages.
Perhaps @geeknoid @rshriram can confirm?

[geeknoid]

/lgtm
/approve

[istio-testing]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[geeknoid]

Replaced by #866 which deletes the file.