Improves documentation formatting of cleanup.py

Change-Id: I105b024332e2ae74ab251bd4d525845da424b132
diff --git a/tempest/cmd/cleanup.py b/tempest/cmd/cleanup.py
index f36ef56..28f0aa8 100755
--- a/tempest/cmd/cleanup.py
+++ b/tempest/cmd/cleanup.py
@@ -19,18 +19,18 @@
 Runtime Arguments
 -----------------
 
---init-saved-state: Before you can execute cleanup you must initialize
-the saved state by running it with the --init-saved-state flag
+**--init-saved-state**: Before you can execute cleanup you must initialize
+the saved state by running it with the **--init-saved-state** flag
 (creating ./saved_state.json), which protects your deployment from
 cleanup deleting objects you want to keep.  Typically you would run
-cleanup with --init-saved-state prior to a tempest run. If this is not
+cleanup with **--init-saved-state** prior to a tempest run. If this is not
 the case saved_state.json must be edited, removing objects you want
 cleanup to delete.
 
---dry-run: Creates a report (dry_run.json) of the tenants that will be
+**--dry-run**: Creates a report (dry_run.json) of the tenants that will be
 cleaned up (in the "_tenants_to_clean" array), and the global objects
 that will be removed (tenants, users, flavors and images).  Once
-cleanup is executed in normal mode, running it again with --dry-run
+cleanup is executed in normal mode, running it again with **--dry-run**
 should yield an empty report.
 
 **NOTE**: The _tenants_to_clean array in dry-run.json lists the
@@ -38,17 +38,17 @@
 delete the tenant itself. This may differ from the tenants array as you
 can clean the tempest and alternate tempest tenants but by default,
 cleanup deletes the objects in the tempest and alternate tempest tenants
-but does not delete those tenants unless the --delete-tempest-conf-objects
+but does not delete those tenants unless the **--delete-tempest-conf-objects**
 flag is used to force their deletion.
 
 **Normal mode**: running with no arguments, will query your deployment and
 build a list of objects to delete after filtering out the objects found in
-saved_state.json and based on the --delete-tempest-conf-objects flag.
+saved_state.json and based on the **--delete-tempest-conf-objects** flag.
 
 By default the tempest and alternate tempest users and tenants are not
 deleted and the admin user specified in tempest.conf is never deleted.
 
-Please run with --help to see full list of options.
+Please run with **--help** to see full list of options.
 """
 import argparse
 import json