docs(notification): clean up static notification stories

[tay1orjones]

I noticed during demo today that these stories could use a clean up.

Changelog

Changed

• Improves StaticNotification stories to show a proper use of an inline link, including the required aria-describedby, and opting to use a div with a manually applied subtitle class instead of using the subtitle prop (which only allows a string)
• Updated documentation to more clearly state the impact of rendering this component after the initial render of the page as it relates to screenreader user focus and the DOM.

Removed

• unecessary testing stories that were focused on the aria-describedby warnings

Testing / Reviewing

• Ensure StaticNotification stories work and the docs make sense

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