docs(adk): fix run_async example and correct ticketId payload key

[krishna-dhulipalla]

Problem

The example in contributing/samples/human_in_loop/README.md shows:

await runner.run_async(...)

However, run_async returns an async generator, so awaiting it raises:

TypeError: object async_generator can't be used in 'await' expression

Additionally, the example payload uses "ticket-id" while ADK tools and other examples use "ticketId", creating a mismatch that breaks copy/paste usage.

Solution

• Updated the snippet to consume the async generator correctly:

async for event in runner.run_async(...):
    ...

• Aligned the payload key from "ticket-id" → "ticketId" for consistency with ADK schema and other examples.

These changes make the example runnable and consistent with the API’s actual behavior.

Testing Plan

This PR is a small documentation correction, so no unit tests are required per contribution guidelines.

• Verified the corrected snippet manually to ensure it no longer raises TypeError.

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas. (N/A – docs only)
• I have added tests that prove my fix is effective or that my feature works. (N/A – docs only)
• New and existing unit tests pass locally with my changes. (N/A – docs only)
• I have manually tested my changes end-to-end.
• Any dependent changes have been merged and published in downstream modules. (N/A)

[gemini-code-assist]

Summary of Changes

Hello @krishna-dhulipalla, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses two critical documentation issues within the human_in_loop example. It corrects the usage of an async generator to properly iterate over its events and standardizes a payload key for consistency across the ADK ecosystem. These changes ensure the example is runnable, accurate, and aligned with the API's intended behavior.

Highlights

• Fix run_async example usage: The example in contributing/samples/human_in_loop/README.md incorrectly awaited runner.run_async directly. Since run_async returns an async generator, the snippet has been updated to correctly consume it using async for to prevent a TypeError.
• Correct ticketId payload key: The payload key for ticket-id has been standardized to ticketId in the example to ensure consistency with ADK tools, schema, and other examples, preventing mismatches and improving copy-paste usability.

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[gemini-code-assist]

Code Review

This pull request correctly addresses two issues in the human_in_loop sample documentation. Changing "ticket-id" to "ticketId" ensures consistency with the rest of the ADK, and fixing the run_async example to correctly consume the async generator makes the documentation runnable and accurate. These are valuable improvements. I've added one suggestion to make the code example slightly more illustrative for new users.

[adk-bot]

Thank you @krishna-dhulipalla for your contribution! 🎉

Your changes have been successfully imported and merged via Copybara in commit 4111f85.

Closing this PR as the changes are now in the main branch.