docs: Fix broken links in Go sample README

[bayamasa]

Changes

• Python Sample link: ../../../../python/...\ → ../../../../../python/...\
• Go Implementation Guide link: ../../README.md\ → ../../../../README.md\
  The paths were incorrect due to missing parent directory levels."

Description

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Fixes no issues

[gemini-code-assist]

Summary of Changes

Hello @bayamasa, 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 documentation accuracy by fixing broken relative links within a Go sample's README file. The changes ensure that users can correctly navigate to related Python samples and the Go implementation guide, thereby improving the overall usability and reliability of the project's documentation.

Highlights

• Documentation Link Fixes: Corrected two broken relative links within the samples/go/scenarios/a2a/human-present/cards/README.md file. The original paths were incorrect due to missing parent directory levels.
• Python Sample Link Update: The link to the 'Python Sample (with Shopping Agent)' was updated from ../../../../python/... to ../../../../../python/... to point to the correct location.
• Go Implementation Guide Link Update: The link to the 'Go Implementation Guide' was updated from ../../README.md to ../../../../README.md to resolve an incorrect relative path.

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[gemini-code-assist]

Code Review

This pull request correctly fixes two broken links in the Go sample's README file. I've added one suggestion to also correct a third, related link in the same section that points to the main protocol documentation. Applying this suggestion will make the documentation links fully accurate.