Alerts section in Markdown page contains invalid sample alert, and is missing alert type

[chalin]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/contributing/writing-for-github-docs/using-markdown-and-liquid-in-github-docs#alerts

What part(s) of the article would you like to see updated?

There are two issues with the Alerts section of https://docs.github.com/en/contributing/writing-for-github-docs/using-markdown-and-liquid-in-github-docs#alerts:

1. The given one-line alert example:

   > [!NOTE] Keep this in mind.

   doesn't render / isn't supported as you can see next:

   [!NOTE] Keep this in mind.

2. The list of types is missing Important, as was noted and fixed elsewhere:

   • the ''important'' alert isn't documented #35860
   • Add a section for the Important alert type to the style guide #35875

   It is probably best to keep things DRY and refer readers to the style guide.

Additional information

No response

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