Create warning directive page

[Rageking8]

Fixes #4703

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[learn-build-service-prod]

Learn Build status updates of commit d06be5a:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/preprocessor/hash-error-directive-c-cpp.md	✅Succeeded
docs/preprocessor/hash-warning-directive-c-cpp.md	✅Succeeded

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Learn Build status updates of commit 6f18afe:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/preprocessor/hash-error-directive-c-cpp.md	✅Succeeded
docs/preprocessor/hash-warning-directive-c-cpp.md	✅Succeeded
docs/preprocessor/preprocessor-directives.md	✅Succeeded

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Learn Build status updates of commit c523295:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/preprocessor/hash-error-directive-c-cpp.md	✅Succeeded
docs/preprocessor/hash-warning-directive-c-cpp.md	✅Succeeded
docs/preprocessor/preprocessor-directives.md	✅Succeeded
docs/preprocessor/toc.yml	✅Succeeded

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[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]

Thank you. I'll hang onto this but won't send it through now because we don't support this directive yet.

[TylerMSFT]

@Rageking8, I'm going through PRs and this feature still isn't implemented yet (as of 1/28/2025). I will come back to this once it is. I haven't forgotten it :-)

[v-dirichards]

Closing/reopening to refresh the CLA status

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@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 c523295:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/preprocessor/hash-error-directive-c-cpp.md	✅Succeeded
docs/preprocessor/hash-warning-directive-c-cpp.md	✅Succeeded
docs/preprocessor/preprocessor-directives.md	✅Succeeded
docs/preprocessor/toc.yml	✅Succeeded

For more details, please refer to the build report.

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PRMerger Results

Issue	Description
Added File(s)	This PR contains added files. New files require human review.
Yaml File(s)	This PR includes changes to .yml file(s) owned by another author.
File Change Percent	This PR contains file(s) with more than 30% file change.

[v-dirichards]

Editorial changes LGTM

[Rastaban]

The content looks good to me.

[TylerMSFT]

Excellent. I'll port this to the private repo, stage it, and get it published (a procedural thing since we don't add new topics from the public repo)
@Rageking8 - thank you very much for writing this topic up!

[TylerMSFT]

Closing because I've ported this work to the private repo. I'll publish it from there.
See PR #6119