Add new supported file types to ToMarkdown

[Naapperas]

Summary

Adds documentation on new supported file types for the ToMarkdown conversion utility.

Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The documentation style guide has been adhered to.

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