Clarify markdown flavor in Markdown Page

[apatel369]

Description (required)

Change is discussed in #9403
I copied the @sarah11918 suggestion in my PR

Related issues & labels (optional)

• Closes Make Markdown flavour explicit on the markdown page #9403

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en	guides/markdown-content.mdx	Source changed, localizations will be marked as outdated.

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[sarah11918]

Looks great! Thank you! 💪