Add documentation about BlockAllSubdomains param

[andreimaneev]

This param was implemented for Federation Settings.

[andreimaneev]

@microsoft-github-policy-service agree company="Microsoft"

[learn-build-service-prod]

Learn Build status updates of commit f106620:

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[learn-build-service-prod]

Learn Build status updates of commit 3b921fc:

✅ Validation status: passed

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skype/skype-ps/skype/Set-CsTenantFederationConfiguration.md	✅Succeeded	View (skype-ps)

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[andreimaneev]

Convert to draft until change is rolled out.

[learn-build-service-prod]

Learn Build status updates of commit 6b63cbd:

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[williamlooney]

Approved. Example 10 is complete.

[learn-build-service-prod]

Learn Build status updates of commit 3861a67:

✅ Validation status: passed

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skype/skype-ps/skype/Set-CsTenantFederationConfiguration.md	✅Succeeded	View (skype-ps)

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[learn-build-service-prod]

Learn Build status updates of commit 6e60704:

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skype/skype-ps/skype/Set-CsTenantFederationConfiguration.md	✅Succeeded	View (skype-ps)

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[williamlooney]

New sentences are better