Apply suggestions from code review

Author: timja

src/main/java/io/jenkins/plugins/designlibrary/EmptyStates.java

@@ -18,7 +18,7 @@ public String getIconFileName() {
 
     @Override
     public String getDescription() {
-        return "Displays informative messages when no data is available.";
+        return "For when there is no data, no configuration or no plugins installed that support the required feature an empty state can be provided instead.";
     }
 
     @Extension

src/main/resources/io/jenkins/plugins/designlibrary/EmptyStates/index.properties

@@ -2,8 +2,8 @@ noticeTitle=No plugins installed
 parameters=Supported Parameters:
 parameters.title=The message displayed in the notice box
 parameters.icon=The icon shown with the message
-descriptionChildContent=You can also include child content within the notice for additional instructions.
+descriptionChildContent=You can also include child content within the notice as a call to action
+
 childSectionTitle=Child content inside notices
 childNoticeTitle=No jobs created
 newJobText=Create your first job
-