Update asan.md to remove PGO from supported optimization levels

[zacklj89]

PGO is incompatible with /fsanitize=address. When you try, you are met with

C5084: Profile-guided optimization is not supported alongside Address Sanitizer. Address Sanitizer should not be used in production

[prmerger-automator]

@zacklj89 : 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 d7c307a:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/sanitizers/asan.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

[learn-build-service-prod]

Learn Build status updates of commit e03381a:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/sanitizers/asan.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

Thanks for approving these changes!

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]

I was waiting for the author to sign off but I think I can do it in this case.
#sign-off