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/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"