Fixed missing compiler option

[Omcsesz]

fixes MicrosoftDocs/cpp-docs-pr#5476

[prmerger-automator]

@Omcsesz : 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 60ba59b:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/build/reference/compiler-options-listed-alphabetically.md	✅Succeeded

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[learn-build-service-prod]

Learn Build status updates of commit f2ad6db:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/build/reference/compiler-options-listed-alphabetically.md	✅Succeeded
docs/build/reference/compiler-options-listed-by-category.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

[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]

Hi,
Unfortunately, I can't take this change. The purpose of the brackets is to introduce a link. You've added the brackets but that's improper markdown because there is no link target. We don't have a doc for /GU, which is why it doesn't have brackets around it.