docs: add prerequisites, examples, and release info to locks tutorial

[akshatj536]

Summary

Adds missing prerequisites, command execution example, and lock release documentation to the locks tutorial.

Changes

• Added cluster setup prerequisite
• Added command execution example with auto-release
• Documented three lock release methods
• Added default values to --endpoints and --ttl options

Context

Addresses part of #794 by filling straightforward documentation gaps. Further improvements (multi-client examples, detailed mechanics) will follow in subsequent PRs.

Testing

• Tested locally with npm run serve
• Verified markdown and links render correctly

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @akshatj536. 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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[wendy-ha18]

In general, we don't recommend using GIF formats due to issues with maintainability, large file sizes, and lack of accessibility. Could you please consider explaining the guidance thoroughly in the written content first, and removing the GIF from this section?

[wendy-ha18]

I’ll loop in @ronaldngounou for review since he worked on improving this guidance before.

Hi Ronald, could you please help review this PR when you have time? Thank you.

[jberkus]

Hey, this example is wrong, because the original tutorial is wrong. For this form of the lock, you need to actually send etcd a command, like updating a key.

[jberkus]

I'd like to see more here for setup. For example, the user will need to have multiple, separate shell sessions with etcdctl clients in order to try this out.