Fixed formatting for build solution code block

The code block for step 6 of "Create a plug-in project and add a reference to it in your solution" isn't displayed correctly due to a missing line.

Author: joshcampbell191

powerapps-docs/developer/component-framework/import-custom-controls.md

@@ -136,6 +136,7 @@ Power Apps CLI now supports creating a plug-in project and packaging it in a sol
     ```
 
 6.    Run the command to build the solution and the referenced plug-in.
+
     ```CLI
     msbuild
     ```