Update MSA app validation information

[Jackson-Woods]

• Remove tag row since value does not differ by signInAudience
• Move tag information to manifest reference
• Remove wildcard note from front-channel logout URL for MSA
• Clarify app roles note for MSA apps

[prmerger-automator]

@Jackson-Woods : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[Jackson-Woods]

@will-bartlett please see this PR based on your notes, thank you!

[learn-build-service-prod]

Learn Build status updates of commit e573cd1:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/identity-platform/reference-app-manifest.md	✅Succeeded
docs/identity-platform/reference-microsoft-graph-app-manifest.md	✅Succeeded
docs/identity-platform/supported-accounts-validation.md	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

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[ttorble]

@rwike77 and @cilwerner

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