Update AAD.3.1v1 to include device-bound passkeys language and resource to AAD.3.1

[ahuynhMITRE]

🗣 Description

Microsoft Entra ID has added support for device-bound passkeys stored on computers and mobile devices as an authentication method, in addition to the existing support for FIDO2 security keys. This enables users to perform phishing-resistant authentication using the devices that they already have. This PR will add additional language to the description for AAD.3.1v1 and add a new resource link to note this new support.

💭 Motivation and context

Change is required to keep the documentation up to date with the new phishing-resistant authentication method now supported in Microsoft Entra ID.

Closes #1203

🧪 Testing

N/A currently only an SCB update

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• PR targets the correct parent branch (e.g., main or release-name) for merge.
• Changes are limited to a single goal - eschew scope creep!
• Changes are sized such that they do not touch excessive number of files.
• Related issues these changes resolve are linked preferably via closing keywords.
• All relevant type-of-change labels added.
• All relevant project fields are set.
• All relevant repo and/or project documentation updated to reflect these changes.
• All relevant functional tests passed.
• All automated checks (e.g., linting, static analysis, unit/smoke tests) passed.

✅ Pre-merge checklist

• PR passed smoke test check.

• Feature branch has been rebased against changes from parent branch, as needed

  Use Rebase branch button below or use this reference to rebase from the command line.

• Resolved all merge conflicts on branch

• Notified merge coordinator that PR is ready for merge via comment mention

✅ Post-merge checklist

• Feature branch deleted after merge to clean up repository.
• Verified that all checks pass on parent branch (e.g., main or release-name) after merge.