Update 03_06.md

03_06.md

@@ -1,7 +1,9 @@
 # Learning Jenkins, 03-06: Choice Parameters
 Create a freestyle job with one build step.
 
-# WINDOWS SYSTEMS
+Add a choice parameter with three or more choices.
+
+## WINDOWS SYSTEMS
 If you are running Jenkins on a Windows system:
 
 1. Select the `Execute Windows batch command` build step
@@ -13,7 +15,7 @@ If you are running Jenkins on a Windows system:
 
 [Follow this link for more details on Windows](WINDOWS.md)
 
-# MacOS, Linux, and Docker
+## MacOS, Linux, and Docker
 If you are running Jenkins on MacOS, Linux, or Docker:
 
 1. Select the `Execute shell` build step.
@@ -24,4 +26,3 @@ echo "ENVIRONMENT = $ENVIRONMENT"
 ```
 
 [Follow this link for more details on MacOS, Linux, and Docker](MAC_LINUX_DOCKER.md)
-