docs(examples): standardize prerequisites section and improve clarity

[azarboon]

Description

This update makes the prerequisites section for examples clearer and standardized. This new PR incorporates suggestions from @lizradway in this comment.

Type of Change

• New content addition
• Content update/revision
• Structure/organization improvement
• Typo/formatting fix
• Bug fix
• Other (please describe):

Content update - documentation

Motivation and Context

The cli-reference-agent example stood out among the examples because its prerequisites section was repetitive and omitted pipx. I have corrected this by adding the missing prerequisite, removing duplicates, and making the prerequisites section more coherent across both this example and its parent page.

Additionally, the requirement for access to the Claude 4 model to run examples was fragmented in the documentation. I have clarified this, as I personally encountered errors when starting with Strands due to lack of access. This change improves clarity and makes onboarding smoother for new users.

Overall, this update enhances readability and navigation of the documentation.

This PR incorporates suggestions from @lizradway in this comment.

Areas Affected

• docs/examples/README.md
• docs/examples/python/cli-reference-agent.md
• docs/user-guide/quickstart.md
• docs/user-guide/quickstart/python.md

Screenshots

Checklist

• I have read the CONTRIBUTING document
• My changes follow the project's documentation style
• I have tested the documentation locally using mkdocs serve
• Links in the documentation are valid and working
• Images/diagrams are properly sized and formatted
• All new and existing tests pass

Additional Notes

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