Make tox -e docs work

There were some problems in the documentaiton that
prevented tox -e docs from working.  Also changed
attention to WARNING since attention was not as eye-grabbing
as I'd hoped during a previous review.

Change-Id: I2b661afa2cd4a4331bbcc99240d3e127a5d94a11

doc/image-building.rst

@@ -147,8 +147,8 @@ Kolla images.
 
 This offers a lot of flexibility on how images are built, e.g. installing extra
 packages as part of the build, tweaking settings, installing plugins, and
-numerous other capabilities. Some of these examples are described in more detail
-below.
+numerous other capabilities. Some of these examples are described in more
+detail below.
 
 Generic Customisation
 ---------------------
@@ -188,8 +188,8 @@ Package Customisation
 ---------------------
 
 Packages installed as part of a container build can be overridden, appended to,
-and deleted. Taking the Horizon example, the following packages are installed as
-part of a binary install type build:
+and deleted. Taking the Horizon example, the following packages are installed
+as part of a binary install type build:
 
 * ``openstack-dashboard``
 * ``httpd``

doc/quickstart.rst

@@ -49,9 +49,10 @@ and OverlayFS. In order to update kernel in Ubuntu 14.04 LTS to 4.2, run:
 
     apt-get install linux-image-generic-lts-wily
 
-.. attention:: Operators performing an evaluation or deployment should use a
-  stable release.  Operators performing development (or developers) should use
-  master.
+.. WARNING::
+   Operators performing an evaluation or deployment should use a stable
+   branch.  Operators performing development (or developers) should use
+   master.
 
 .. note:: Install is *very* sensitive about version of components. Please
   review carefully because default Operating System repos are likely out of
@@ -262,14 +263,15 @@ requirements it can be installed by:
 
     apt-get install ansible
 
-.. attention:: Kolla uses PBR in its implementation. PBR provides version 
-    information to Kolla about the package in use. This information is later 
-    used when building images to specify the Docker tag used in the image built.  
-    When installing the Kolla package via pip, PBR will always use the PBR version 
-    information. When obtaining a copy of the software via git, PBR will use the 
-    git version information, but **ONLY** if Kolla has not been pip installed via 
-    the pip package manager. This is why there is an operator workflow and a 
-    developer workflow.
+.. WARNING::
+   Kolla uses PBR in its implementation. PBR provides version information
+   to Kolla about the package in use. This information is later used when
+   building images to specify the Docker tag used in the image built.  When
+   installing the Kolla package via pip, PBR will always use the PBR version
+   information. When obtaining a copy of the software via git, PBR will use
+   the git version information, but **ONLY** if Kolla has not been pip
+   installed via the pip package manager. This is why there is an operator
+   workflow and a developer workflow.
 
 Installing Kolla for evaluation or deployment
 ---------------------------------------------