Document risk of adding infinite extensions when using global marked instance

[MaddyGuthridge]

Marked version:

Markdown flavor: Markdown.pl|CommonMark|GitHub Flavored Markdown|n/a

Description

• Fixes Documentation: recommended method of adding Marked extensions may cause recursion-related error #3701 (if fixing a known issue; otherwise, describe issue using the following format)

Contributor

• Test(s) exist to ensure functionality and minimize regression (if no tests added, list tests covering this PR); or,
• no tests required for this PR.
• If submitting new feature, it has been documented in the appropriate places.

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• CI is green (no forced merge required).
• Squash and Merge PR following conventional commit guidelines.

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Name	Status	Preview	Comments	Updated (UTC)
marked-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 28, 2025 10:45am

[UziTech]

Thanks for updating the docs! 💯

Documentation is always better from the perspective of someone that needs to read it.