Fix typo in A2A EXPERIMENTAL warning

[ftnext]

Please ensure you have read the contribution guide before creating a pull request.

Link to Issue or Description of Change

2. Or, if no issue exists, describe the change:

Problem:
I found a typo: arethemselves

/.../adk-python/src/google/adk/a2a/converters/event_converter.py:245: UserWarning: [EXPERIMENTAL] convert_a2a_message_to_event: ADK Implementation for A2A support (A2aAgentExecutor, RemoteA2aAgent and corresponding supporting components etc.) is in experimental mode and is subjected to breaking changes. A2A protocol and SDK arethemselves not experimental. Once it's stable enough the experimental mode will be removed. Your feedback is welcome.

Solution:
Just fix

Testing Plan

This is typo fix

Unit Tests:

N/A

Manual End-to-End (E2E) Tests:

N/A

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.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.
• Any dependent changes have been merged and published in downstream modules.

[gemini-code-assist]

Summary of Changes

Hello @ftnext, 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 a minor but important textual correction within the A2A experimental warning message. The change ensures the warning is grammatically correct and improves readability, without altering any functional aspects of the code.

Highlights

• Typo Fix: Corrected a grammatical error in the experimental warning message within the A2A module, specifically adding a space between 'are' and 'themselves'.

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Changelog

• src/google/adk/a2a/experimental.py
  • Corrected a typo in the default_message string, adding a space between 'are' and 'themselves'.

Activity

• The author identified a typo in an experimental warning message.
• The author created this pull request to fix the identified typo.
• The author indicated that unit and end-to-end tests were not applicable for this typo fix.
• The author completed a self-review and confirmed reading the contribution guide.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a typo in the A2A experimental feature warning message. I've added one suggestion to further improve the grammar of the same message for better clarity.

[ryanaiagent]

Hi @ftnext ,Thank you for your contribution! We appreciate you taking the time to submit this pull request. Can you also apply the suggestion.

[ftnext]

@ryanaiagent Thanks for your comment! I applied Gemini's suggestion.