fix: MD009 trailing whitespace

[nschonni]

Fixes #

Docs for Toolkit PR #

What changes to the docs does this PR provide?

Leftovers added before other PR landed

PR Checklist

Please check if your PR fulfills the following requirements:

• Correctly picked the right branch to base the change off (master for new features, live for typos/improvements)
• For new pages, used the provided template
• For new features, added an entry in the Table of Contents
• Ran against a spell and grammar checker
• Contains NO breaking changes

Other information

[opbld30]

Docs Build status updates of commit 8d6ce09:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/animations/AnimationBuilder.md	✅Succeeded	View
docs/animations/AnimationSet.md	✅Succeeded	View
docs/controls/datagrid_guidance/group_sort_filter.md	✅Succeeded	View
docs/extensions/TextBoxExtensions.md	✅Succeeded	View

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel

[opbld33]

Docs Build status updates of commit 6aacaaf:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• [Error-GitBranchDeletedOrForcePushed] Cannot sync git repo to specified commit because branch md009-leftovers has been deleted or has been force pushed

For more details, please refer to the build report.

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Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

Note: Your PR may contain errors or warnings unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel