Aligning with Bash style guide

Changed variables to align with bash style guide

Author: lanicolas

articles/azure-resource-manager/templates/deployment-script-template-configure-dev.md

@@ -34,11 +34,11 @@ $DeploymentScriptOutputs['text'] = $output
 For an Azure CLI container image, you can create a *hello.sh* file by using the following content:
 
 ```bash
-firstname=$1
-lastname=$2
-output="{\"name\":{\"displayName\":\"$firstname $lastname\",\"firstName\":\"$firstname\",\"lastName\":\"$lastname\"}}"
+FIRSTNAME=$1
+LASTNAME=$2
+OUTPUT="{\"name\":{\"displayName\":\"$FIRSTNAME $LASTNAME\",\"firstName\":\"$FIRSTNAME\",\"lastName\":\"$LASTNAME\"}}"
 echo -n "Hello "
-echo $output | jq -r '.name.displayName'
+echo $OUTPUT | jq -r '.name.displayName'
 ```
 
 > [!NOTE]