Add a section for the Important alert type to the style guide

[Michael21107]

Why:

Closes:
#35860

What's being changed (if available, include any code snippets, screenshots, or gifs):

Adds the fifth alert type, Important, to the style guide.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require a SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing.

[github-actions]

Automatically generated comment ℹ️

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
contributing/style-guide-and-content-model/style-guide.md	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10	fpt ghec ghes@ 3.15 3.14 3.13 3.12 3.11 3.10

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server

[nguyenalex836]

@Michael21107 Thanks so much for opening this PR! I'll get this triaged for review, and as mentioned earlier, have the team provide suggestions regarding the alert type description 💛

[mchammer01]

@Michael21107 - thanks for fixing this omission ✨
I made two suggestions that I'm going to apply.

[mchammer01]

LGTM

[github-actions]

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