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"
diff --git a/exercises/boot_from_volume.sh b/exercises/boot_from_volume.sh
index 634a6d5..3b3d3ba 100755
--- a/exercises/boot_from_volume.sh
+++ b/exercises/boot_from_volume.sh
@@ -3,8 +3,9 @@
 # **boot_from_volume.sh**
 
 # This script demonstrates how to boot from a volume.  It does the following:
-#  *  Create a bootable volume
-#  *  Boot a volume-backed instance
+#
+# *  Create a bootable volume
+# *  Boot a volume-backed instance
 
 echo "*********************************************************************"
 echo "Begin DevStack Exercise: $0"