Add some more comments.

[kixelated]

No description provided.

[coderabbitai]

Walkthrough

This pull request adds inline comments and documentation to two source files in the watch module. The audio source file receives a comment explaining the purpose of the sync field for targeting latency and audio-video synchronization. The video source file receives extensive comments documenting VideoDecoder behavior, including parallel frame processing, potential race conditions, backpressure mechanisms, frame buffering limits, and Firefox-specific constraints. No functional code logic or control flow modifications are made; the changes are purely documentary in nature.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No description was provided by the author.	Add a pull request description explaining the purpose and scope of the added comments.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the pull request, which adds comments to clarify VideoDecoder and audio source behavior.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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