chore(doc): update Prezto completion

[abn]

Closes: #8607

Summary by Sourcery

Documentation:

• Add a note about restarting the shell for tab completion changes to take effect.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the documentation for Prezto completion, providing a more robust solution for users who have issues with the initial setup.

Flow diagram for Poetry Prezto completion troubleshooting

flowchart TD
    A[Start] --> B[Run completion command]
    B --> C[Save to Prezto path]
    C --> D{Completions working?}
    D -->|Yes| E[Done]
    D -->|No| F[Remove zcompcache]
    F --> G[Start new shell]
    G --> D

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File-Level Changes

Change	Details	Files
Updated the Prezto completion instructions to include a troubleshooting step.	Added a note to remove ~/.cache/prezto/zcompcache if completions don't work.	docs/_index.md
Moved the note about restarting the shell to be before the shell specific instructions.	Moved the note about restarting the shell to be before the shell specific instructions.	docs/_index.md

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[sourcery-ai]

Hey @abn - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[github-actions]

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