Fix api-ref title levels and index

We had a few instances where the title level used for calls in the
api-ref was wrong, resulting in the api call being hidden inside the
details of another title level.

This fixes title levels to be consistent and adds a missing inclusion to
the v2 index.

Closes-bug: #1787203

Change-Id: I602250117dbf52f9e031e945040b45f089d8602e
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

api-ref/source/v2/ext-backups.inc

@@ -177,7 +177,7 @@ Request
 
 
 Restore backup
---------------
+~~~~~~~~~~~~~~
 
 .. rest_method::  POST /v2/{project_id}/backups/{backup_id}/restore
 

api-ref/source/v2/index.rst

@@ -23,6 +23,7 @@ Block Storage API V2 (DEPRECATED)
 .. include:: volume-type-access.inc
 .. include:: volumes-v2-extensions.inc
 .. include:: volumes-v2-snapshots.inc
+.. include:: volumes-v2-snapshots-actions.inc
 .. include:: volumes-v2-types.inc
 .. include:: volumes-v2-versions.inc
 .. include:: volumes-v2-volumes-actions.inc

api-ref/source/v2/qos-specs-v2-qos-specs.inc

@@ -320,7 +320,7 @@ Response Parameters
 
 
 List QoS specs
---------------
+~~~~~~~~~~~~~~
 
 .. rest_method::  GET /v2/{project_id}/qos-specs
 

api-ref/source/v2/volumes-v2-snapshots-actions.inc

@@ -1,14 +1,13 @@
 .. -*- rst -*-
 
-====================================
 Snapshot actions (snapshots, action)
 ====================================
 
 Administrator only. Resets status for a snapshot.
 
 
-Reset a snapshot's status
+Reset snapshot's status
-=========================
+~~~~~~~~~~~~~~~~~~~~~~~
 
 .. rest_method::  POST /v2/{project_id}/snapshots/{snapshot_id}/action