Fix wrong close tag in code samples for uui-color-swatch element

[greystate]

Description

Browsing the docs, I noticed the code samples had mismatching open- and closetags, which was probably a copy & paste error. I don't really know which boxes to tick below; neither have I done any of the required build steps, so leaving this as a Draft PR for now. I can't tell if it's all necessary for something like this that only changes sample code that's not (I guess?) being tested and/or validated.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (minor updates related to the tooling or maintenance of the repository, does not impact compiled assets)

Motivation and context

How to test?

Screenshots (if appropriate)

Checklist

• If my change requires a change to the documentation, I have updated the documentation in this pull request.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[github-actions]

Hi there @greystate, thank you for this contribution! 👍

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• It's clear what problem this is solving, there's a connected issue or a description of what the changes do and how to test them
• The automated tests all pass (see "Checks" tab on this PR)
• The level of security for this contribution is the same or improved
• The level of performance for this contribution is the same or improved
• Avoids creating breaking changes; note that behavioral changes might also be perceived as breaking
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[iOvergaard]

Looks good to me as it is. Thanks for fixing the docs!