Clean up C2397

[Rageking8]

Make the example more uniform with the others, remove the need to use std::vector and made the doubles in the initializers more explicit (2 -> 2.0). Also made the code block cpp to get proper syntax highlighting on the page.

[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 de37bf1:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/error-messages/compiler-errors-1/compiler-error-c2397.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?

When the changes are ready for publication, add a #sign-off comment to signal that the PR is ready for the review team to merge.

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

[TylerMSFT]

Your example is better than what was in there. Much thanks!

[TylerMSFT]

#sign-off

[ShannonLeavitt]

Thanks for your contribution!