FAQ converted into YML (MicrosoftDocs#3631)

* FAQ converted into YML

* Update dll-frequently-asked-questions.yml

* warning fixed

* warning fixed

* atl-control-containment-faq.md converted into YML

* warning fixed

* Update dll-frequently-asked-questions.yml

* Update dll-frequently-asked-questions.yml

* Update attribute-programming-faq.yml

Co-authored-by: Jeff Borsecnik <[email protected]>

Author: v-hearya

docs/atl/active-template-library-atl-concepts.md

@@ -28,7 +28,7 @@ Describes the implementation and creation of collections and enumerators in ATL.
 [Composite Control Fundamentals](atl-composite-control-fundamentals.md)<br/>
 Provides step-by-step instructions for creating a composite control. A composite control is a type of ActiveX control that can contain other ActiveX controls or Windows controls.
 
-[ATL Control Containment FAQ](atl-control-containment-faq.md)<br/>
+[ATL Control Containment FAQ](atl-control-containment-faq.yml)<br/>
 Covers the fundamental questions related to hosting controls with ATL.
 
 [ATL COM Property Pages](atl-com-property-pages.md)<br/>