Adjust C4556 example

[Rageking8]

Summary:

• Align warning message with the one found in "Microsoft C/C++ compiler warnings C4400 through C4599"
• Adjust example:
  • Simplify example by moving logic into main and removing test
  • Fix C6001 due to usage of uninitialized variable m
  • Fix C4799 due to missing EMMS instruction
• Edit metadata

[prmerger-automator]

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

[learn-build-service-prod]

Learn Build status updates of commit d550eb6:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/error-messages/compiler-warnings/compiler-warning-level-1-c4556.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

[prmerger-automator]

PRMerger Results

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

[ttorble]

@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]

Your example is nice because it gets rid of the extra warning so we can focus better on what the topic is about. Thank you.

[TylerMSFT]

#sign-off