mesh: unhide service settings documentation

[dlanov]

Unhide MeshConfig.ServiceSettings and the service_settings field so they appear in the generated MeshConfig API reference.

This removes the two $hide_from_docs markers and regenerates the corresponding Go and HTML outputs. It does not change the API or runtime behavior.

Fixes istio/istio#54762

Validation:

• make gen
• make local-lint-protos
• make test
• git diff --check

[istio-policy-bot]

🤔 🐛 You appear to be fixing a bug in Go code, yet your PR doesn't include updates to any test files. Did you forget to add a test?

Courtesy of your friendly test nag.

[istio-policy-bot]

😊 Welcome @dlanov! This is either your first contribution to the Istio api repo, or it's been
a while since you've been here.

You can learn more about the Istio working groups, Code of Conduct, and contribution guidelines
by referring to Contributing to Istio.

Thanks for contributing!

Courtesy of your friendly welcome wagon.

[istio-testing]

Hi @dlanov. 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.

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

I understand the commands that are listed here.

Details

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