Added comment explaining fix to IRS demo on windows.

samples/irs-demo/build.gradle

@@ -106,6 +106,7 @@ task integrationTest(type: Test, dependsOn: []) {
 tasks.withType(CreateStartScripts).each { task ->
     task.doLast {
         String text = task.windowsScript.text
+        // Replaces the per file classpath (which are all jars in "lib" with a wildcard on lib
         text = text.replaceFirst(/(set CLASSPATH=%APP_HOME%\\lib\\).*/, { "${it[1]}*" })
         task.windowsScript.write text
     }