update docs for self-assigned JWTs

[Ishan-gupta2005]

Description

Updates etcd v3 authentication design under learning section to clarify how users can directly set JWT tokens at client initialization.

Changes

• Documents JWT token direct setting capability for users managing tokens externally
• Documents Use cases and workflow
• Documents how it differs from standard authentication
• Applied consistently across v3.5, v3.6, and v3.7 documentation

Related Issues

#1088 : Update docs for self-managed JWTs
etcd-io/etcd#19863: Allow users to set a JWT token directly

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @Ishan-gupta2005. Thanks for your PR.

I'm waiting for a etcd-io 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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[ronaldngounou]

Thank you for your contribution @Ishan-gupta2005 . This is very a very useful information to be updated.

[ronaldngounou]

/retest

[ronaldngounou]

@Ishan-gupta2005 Could you please address the lint failures?

[Ishan-gupta2005]

Thanks for pointing that out! I’ll review the lint errors and push fixes as soon as possible

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[Ishan-gupta2005]

/retest

[k8s-ci-robot]

@Ishan-gupta2005: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

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In response to this:

/retest

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[Ishan-gupta2005]

@ronaldngounou I've fixed all the linting issues that were reported and verified locally by running the linting script. I hope it's ready for review now.

[ronaldngounou]

/retest