Fix shocco errors and warnings

A few Markdown-oriented issues were causing Docutils errors to
leak into the end-user docs on http://devstack.org

Change-Id: I51fa9698afb1bfb48596478d83bd1fdcd84ac52e
diff --git a/tools/create-stack-user.sh b/tools/create-stack-user.sh
index 2251d1e..50f6592 100755
--- a/tools/create-stack-user.sh
+++ b/tools/create-stack-user.sh
@@ -5,7 +5,9 @@
 # Create a user account suitable for running DevStack
 # - create a group named $STACK_USER if it does not exist
 # - create a user named $STACK_USER if it does not exist
+#
 #   - home is $DEST
+#
 # - configure sudo for $STACK_USER
 
 # ``stack.sh`` was never intended to run as root.  It had a hack to do what is