Update WDS trainer guide - OSS PaaS and DevOps.md

Feb2020 test/fix QC.

Whiteboard design session/WDS trainer guide - OSS PaaS and DevOps.md

@@ -22,7 +22,7 @@ The names of manufacturers, products, or URLs are provided for informational pur
 
 Microsoft and the trademarks listed at <https://www.microsoft.com/en-us/legal/intellectualproperty/Trademarks/Usage/General.aspx> are trademarks of the Microsoft group of companies. All other trademarks are property of their respective owners.
 
-## Contents
+**Contents**
 
 - [Trainer information](#trainer-information)
   - [Role of the trainer](#role-of-the-trainer)