Improve generated documentation for load balancer fields

[rajeshd2091]

This PR improves the generated API documentation for TrafficPolicy.LoadBalancer by adding and refining proto comments for its fields.

Problem

1. Some fields under DestinationRule.spec.trafficPolicy.loadBalancer appeared with <no description> in kubectl explain

2. The generated API reference also omitted descriptions for the same fields, resulting in incomplete API documentation

Changes

• Added a description for the simple field at correct place.
• Added a description for the consistent_hash field at correct place.
• Improved the locality_lb_setting comment formatting by adding a terminating period, allowing the generator to recognize the summary correctly.

Validation

Verified that the updated comments are reflected in:

• kubectl explain destinationrule.spec.trafficPolicy.loadBalancer
• Generated HTML documentation

The affected fields now display meaningful descriptions instead of <no description>:

[istio-testing]

Hi @rajeshd2091. 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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