Remove abundance of horizontal rules

Even one isn't standard in our documentation.

Author: garycentric

CloudAppSecurityDocs/best-practices.md

@@ -136,9 +136,6 @@ Defender for Cloud Apps provides you with the ability to investigate and monitor
 * [File policies](data-protection-policies.md)
 * [Content inspection](content-inspection.md)
 
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 ## Enforce DLP and compliance policies for data stored in the cloud
@@ -149,9 +146,6 @@ Defender for Cloud Apps provides you with the ability to investigate and monitor
 
 * [Governing connected apps](governance-actions.md)
 
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 ## Block and protect download of sensitive data to unmanaged or risky devices