fix quotes in save.py:persistent_cache docstring

[gabrielgrant]

Wrap default filepath in backticks to avoid double underscore rendering as bold

📝 Summary

🔍 Description of Changes

📋 Checklist

• I have read the contributor guidelines.
• For large changes, or changes that affect the public API: this change was discussed or approved through an issue, on Discord, or the community discussions (Please provide a link if applicable).
• I have added tests for the changes made.
• I have run the code and verified that it works as expected.

📜 Reviewers

@akshayka OR @mscolnick

[vercel]

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[github-actions]

All contributors have signed the CLA ✍️ ✅
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[akshayka]

Thanks!

[gabrielgrant]

I have read the CLA Document and I hereby sign the CLA

[gabrielgrant]

Recheck

[github-actions]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.10.7-dev7