Add example of using Account in sample.call file

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2568 65c4cc65-6c06-0410-ace0-fbb531ad65f3

sample.call

@@ -42,3 +42,8 @@ Priority: 1
 #SetVar: file1=/tmp/to
 #SetVar: file2=/tmp/msg
 #SetVar: timestamp=20021023104500
+
+#
+# You may specify an account to be passed to CDRs
+#
+#Account: markster