Quality: ActiveDirectory module formatting fixes batch 2

[robderickson]

Prerequisites

• Existing Issue:

Search the existing quality issues for this repository. If there's an issue that
covers the quality area and articles you want to improve, pick a different quality area
or article set. Don't file a new issue for the same work. Subscribe, react, or comment
on that issue instead.

• Descriptive Title:

Write the title for this issue as a short synopsis. If possible, provide context. For
example, "Quality: Command Syntax in Foo" instead of "Quality: Foo"

Quality Areas

Formatting code samples, Formatting command syntax

Article List

Disable-ADOptionalFeature.md
Enable-ADAccount.md
Enable-ADOptionalFeature.md
Get-ADAccountAuthorizationGroup.md
Get-ADAccountResultantPasswordReplicationPolicy.md
Get-ADAuthenticationPolicy.md
Get-ADAuthenticationPolicySilo.md
Get-ADCentralAccessPolicy.md
Get-ADCentralAccessRule.md
Get-ADClaimTransformPolicy.md