Fix docs errors and warnings

This commit fixes docs errors and warnings. However, 'WARNING: nonlocal
image URI found' is still remaining because it needs an ugly workaround
that is replacing it to raw html.

Change-Id: I4524c1ff4126c87979301d0fb8ac7c9eb6f2f708
diff --git a/doc/source/microversion_testing.rst b/doc/source/microversion_testing.rst
index fc05b12..3568470 100644
--- a/doc/source/microversion_testing.rst
+++ b/doc/source/microversion_testing.rst
@@ -24,6 +24,7 @@
 
   Those should be defined under respective section of each service.
   For example::
+
       [compute]
       min_microversion = None
       max_microversion = latest
@@ -159,7 +160,8 @@
 
 
 Notes about Compute Microversion Tests
-"""""""""""""""""""""""""""""""""""
+""""""""""""""""""""""""""""""""""""""
+
 Some of the compute Microversion tests have been already implemented
 with the Microversion testing framework. So for further tests only
 step 4 is needed.