Merge pull request #3217 from ahardin-rh/2832-followup

Follow-up edits to PR#2832

Author: ahardin-rh

using_images/other_images/jenkins.adoc

@@ -304,10 +304,11 @@ repository with the following directory structure:
 This directory contains those binary Jenkins plug-ins you want to copy into Jenkins.
 
 *_plugins.txt_*::
-This file lists the plug-ins you want to install in the format of:
-```
+This file lists the plug-ins you want to install:
+
+----
 pluginId:pluginVersion
-```
+----
 
 *_configuration/jobs_*::
 This directory contains the Jenkins job definitions.