fix(quickstarts): repair three broken in-repo links in Voices and Veo…

[kkorpal]

Fixes the three broken links the link checker currently reports on main (they surfaced on #1352's CI run and fail any PR whose diff happens to include these files):

• Get_Started_Voices.ipynb — the intro linked to #design_on_replication, but section 3 had no anchor. Added <a name="design_on_replication"></a> above it, matching the existing voice_design / voice_replication anchors.
• Get_started_Veo.ipynb — #r2c was a typo for the existing #r2v ("References-to-video") anchor.
• Get_started_Veo_REST.ipynb — linked to Get_started_imagen_REST.ipynb, but the file is Get_started_imagen_rest.ipynb (lowercase). Worked on macOS's case-insensitive filesystem, broke on Linux/GitHub.
  Markdown-only; no code or outputs changed.
  Validation
• python3 tools/nbfmt_cli.py — clean
• python3 tools/nblint_cli.py — 0 errors
• python3 tools/check_all_links.py on the three files — [SUCCESS] All links are healthy and valid!

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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 cross-references identified by the automated link checker in several quickstart notebooks. By correcting anchor tags and file path casing, the changes ensure that the documentation remains navigable and passes continuous integration checks.

Highlights

• Documentation Link Repair: Corrected three broken internal links across multiple quickstart notebooks to resolve link checker errors and improve documentation navigation.
• CI Validation: Verified all changes using the project's internal link checking and linting tools to ensure compliance with repository standards.

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[gemini-code-assist]

Code Review

This pull request corrects a markdown link anchor in the Get_started_Veo.ipynb notebook, changing #r2c to #r2v in the "Image-to-video" section. No review comments were provided, and the change is straightforward and correct, so there is no additional feedback.