docs: fix broken notebook links in Get_started_Generate_Content

[manumishra12]

Fixes internal links in quickstarts/Get_started_Generate_Content.ipynb that pointed to notebooks which have been renamed or removed. All corrected targets exist in the repo, and the notebook remains valid JSON.

Broken link	Corrected to
../quickstarts/Video.ipynb	../quickstarts/Video_understanding.ipynb
./Image_out.ipynb	./Get_Started_Nano_Banana.ipynb (the cell describes it as "Image generation … aka Nano-banana")
./JSON.ipynb	./JSON_mode.ipynb
./File-API.ipynb	./File_API.ipynb

Verification

• Every corrected target was confirmed to exist on disk.
• The notebook still parses as valid JSON; the diff is limited to the four changed link lines.
• No overlap with other open PRs (docs: fix all broken links across notebooks (paths + deleted/renamed guides) #1273, fix: remaning issues with interactions API across quickstarts #1276, WIP: Upgrade to Gemini 3.1 Flash Live #1177).

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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 broken internal navigation links within the documentation. By updating references to point to the correct, existing files, the changes ensure that users can successfully navigate between related notebooks and guides without encountering 404 errors or dead links.

Highlights

• Link Repair: Corrected multiple broken internal links in 'Get_started_Generate_Content.ipynb' that pointed to renamed or removed notebook files.
• Documentation Update: Updated the 'quickstarts-js/README.md' to point to the correct filename for the Image Output JavaScript quickstart.

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[gemini-code-assist]

Code Review

This pull request updates several notebook and file references in the JavaScript README and the Python Get Started notebook to match updated filenames. Feedback is provided to correct a missing closing double quote in the "Nano-banana" model reference within the Python notebook.