(DOCS-10638): Added line about needing to close other command prompts.

Author: Anthony Sansone

source/includes/steps-create-manually-windows-service-for-mongodb.yaml

@@ -78,6 +78,8 @@ title: Start the MongoDB service.
 stepnum: 5
 ref: start-mongodb-service
 action:
+  pre: |
+    Close all other command prompts, then invoke the following command:
   language: powershell
   copyable: true
   code: |