Fix malformed anchor in headers

[Rageking8]

Fix problem where a malformed anchor causes a whole chunk of text to be rendered as a link.

For example:

[prmerger-automator]

@Rageking8 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 72fc525:

❌ 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 ref +refs/pull/10362/merge has been deleted or has been force pushed.
 If this is pull request, please ensure it is mergeable (no merge conflict) and open (not closed).

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions 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.

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[Court72]

@ghogen, @Mikejo5000, @mgoertz-msft

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[ghogen]

Thanks. I think this used to work, not sure when this broke.

[learn-build-service-prod]

Learn Build status updates of commit 72fc525:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/ide/optimize-visual-studio-startup-time.md	✅Succeeded
docs/ide/walkthrough-creating-a-multiple-computer-build-environment.md	✅Succeeded
docs/modeling/analyze-and-model-your-architecture.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel