Add example and augment C2200 page

[Rageking8]

Summary:

• Remove space character before colon in error message (to match the generated one verbatim)
• Add link to the alloc_text pragma page
• Mention the correct placement of the alloc_text pragma (after declaration but before definition)
• Add short example that generates C2200
• Some metadata cleanup and updates

[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 e9ab516:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/error-messages/compiler-errors-1/compiler-error-c2200.md	✅Succeeded

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[prmerger-automator]

PRMerger Results

Issue	Description
File Change Percent	This PR contains file(s) with more than 30% file change.

[Court72]

@TylerMSFT

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

[TylerMSFT]

Very nice. Thank you for improving this topic!

[TylerMSFT]

#sign-off

[TylerMSFT]

#sign-off