Replace broken NARA video URL in Analyze_a_Video_Historic_Event_Recognition.ipynb

[Giom-V]

Replaces the dead NARA S3 video URL with the copy hosted on the generativeai-downloads GCS bucket and updates the closing section heading for nblint.

Fixes #1417

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[gemini-code-assist]

Summary of Changes

Hello, 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 broken external dependency in the historic event recognition notebook by migrating the source video to a reliable GCS bucket. Additionally, it includes a minor documentation adjustment to ensure the notebook adheres to project linting standards.

Highlights

• Video URL Update: Replaced the broken NARA S3 video URL with a stable copy hosted on the generativeai-downloads GCS bucket.
• Documentation Improvement: Updated the closing section heading in the notebook to 'Next steps' to comply with linting requirements.

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[gemini-code-assist]

Code Review

This pull request updates the video source URL in the historic event recognition notebook to use Google Cloud Storage instead of Amazon S3, and renames the final section to "Next steps". Feedback is provided to ensure the video's source and license are explicitly mentioned in the markdown cell per the style guide, and to fully run the notebook to regenerate consistent execution outputs rather than manually editing them.

[gemini-code-assist]

According to the repository style guide, all external assets used in notebooks must have their source and license explicitly mentioned in the markdown cell that introduces them. Since this video is a public domain work from the National Archives and Records Administration (NARA), please update the description to explicitly state its source and license.

Suggested change

	"This example uses [video of President Ronald Reagan's Speech at the Berlin Wall](https://storage.googleapis.com/generativeai-downloads/videos/President_Ronald_Reagans_Speech_at_the_Berlin_Wall_1987-06-12.mp4) taken on June 12 1987."
	"This example uses a public domain [video of President Ronald Reagan's Speech at the Berlin Wall](https://storage.googleapis.com/generativeai-downloads/videos/President_Ronald_Reagans_Speech_at_the_Berlin_Wall_1987-06-12.mp4) from the National Archives and Records Administration (NARA) taken on June 12 1987."

References

1. Always mention the source and license in the markdown cell that introduces the asset. ^(link)

[gemini-code-assist]

The saved output for the download cell has been manually edited to update the URL on line 124, but the subsequent lines (such as lines 125 and 126) still show resolving and connecting to s3.amazonaws.com. Please run the notebook fully to regenerate and save the correct, consistent outputs for the new Google Cloud Storage URL.

References

1. Ideally we want the outputs to be saved in the notebooks so that one can see what the code does without running it. If none of them changed while some code has, it might be a sign that the notebook has not been run to check that it works. ^(link)