Fix some Markdown formatting issues

Address miscellaneous issues with Markdown formatting in comments which
are consumed by shocco when generating the online documentation.

Change-Id: I953075cdbddbf1f119c6c7e35f039e2e54b79078
diff --git a/exercises/aggregates.sh b/exercises/aggregates.sh
index e5fc7de..96241f9 100755
--- a/exercises/aggregates.sh
+++ b/exercises/aggregates.sh
@@ -3,12 +3,13 @@
 # **aggregates.sh**
 
 # This script demonstrates how to use host aggregates:
-#  *  Create an Aggregate
-#  *  Updating Aggregate details
-#  *  Testing Aggregate metadata
-#  *  Testing Aggregate delete
-#  *  Testing General Aggregates (https://blueprints.launchpad.net/nova/+spec/general-host-aggregates)
-#  *  Testing add/remove hosts (with one host)
+#
+# *  Create an Aggregate
+# *  Updating Aggregate details
+# *  Testing Aggregate metadata
+# *  Testing Aggregate delete
+# *  Testing General Aggregates (https://blueprints.launchpad.net/nova/+spec/general-host-aggregates)
+# *  Testing add/remove hosts (with one host)
 
 echo "**************************************************"
 echo "Begin DevStack Exercise: $0"