[Docs] Fix 1-2-3 list in v1/prefix_caching.md

[windsonsea]

• Fix indentation issues for 1-2-3 list. Normally, MkDocs use 4-spaces of indentions for 1-2-3 list.
• Change term Cache Block to cache block by following suggestions from gemini-code-assistant.

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[gemini-code-assist]

Summary of Changes

Hello @windsonsea, 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 focuses on improving the readability and consistent rendering of the prefix_caching.md documentation by correcting indentation for nested numbered lists. The change ensures that the document adheres to the standard 4-space indentation expected by MkDocs, which should enhance the visual presentation of the content.

Highlights

• Documentation Formatting: I've addressed indentation issues within numbered lists in the v1/prefix_caching.md documentation file. Specifically, nested list items that were previously indented with 3 spaces have been corrected to use 4 spaces, aligning with standard MkDocs formatting for 1-2-3 lists.

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[gemini-code-assist]

Code Review

Thanks for fixing the list indentation in the documentation. This will improve readability. I've also added a couple of suggestions to improve the clarity of the terminology used, which should help developers map the design document to the codebase more easily.

[DarkLight1337]

Thanks for fixing!