Fix document warnings

Also warning-is-error is set in setup.cfg to avoid future warnings.

Change-Id: I4381a47d35b5736c9af0a2cb8bdd330266825922

doc/source/users/proxies/identity_v2.rst

@@ -20,7 +20,7 @@ Extension Operations
    .. automethod:: openstack.identity.v2._proxy.Proxy.get_extension
    .. automethod:: openstack.identity.v2._proxy.Proxy.extensions
 
- User Operations
+User Operations
 ^^^^^^^^^^^^^^^
 
 .. autoclass:: openstack.identity.v2._proxy.Proxy

openstack/database/v1/_proxy.py

@@ -80,7 +80,7 @@ class Proxy(proxy2.BaseProxy):
 
         :param instance: This can be either the ID of an instance
                          or a :class:`~openstack.database.v1.instance.Instance`
-                       instance that the interface belongs to.
+                         instance that the interface belongs to.
         :param kwargs \*\*query: Optional query parameters to be sent to limit
                                  the resources being returned.
 

setup.cfg

@@ -28,6 +28,7 @@ packages =
 source-dir = doc/source
 build-dir = doc/build
 all_files = 1
+warning-is-error = 1
 
 [upload_sphinx]
 upload-dir = doc/build/html