Add Octavia quota to the SDK docs

The patch that added Octavia quota to the SDK forgot to update
the documentation.
This patch corrects that by adding the required section to the
page.

Change-Id: Icfb92c267a10c7526e91d678e00fc522058a92bc

doc/source/user/proxies/load_balancer_v2.rst

@@ -129,6 +129,17 @@ Flavor Operations
    .. automethod:: openstack.load_balancer.v2._proxy.Proxy.find_flavor
    .. automethod:: openstack.load_balancer.v2._proxy.Proxy.update_flavor
 
+Quota Operations
+^^^^^^^^^^^^^^^^
+
+.. autoclass:: openstack.load_balancer.v2._proxy.Proxy
+
+   .. automethod:: openstack.load_balancer.v2._proxy.Proxy.update_quota
+   .. automethod:: openstack.load_balancer.v2._proxy.Proxy.delete_quota
+   .. automethod:: openstack.load_balancer.v2._proxy.Proxy.quotas
+   .. automethod:: openstack.load_balancer.v2._proxy.Proxy.get_quota
+   .. automethod:: openstack.load_balancer.v2._proxy.Proxy.get_quota_default
+
 Amphora Operations
 ^^^^^^^^^^^^^^^^^^
 

doc/source/user/resources/load_balancer/index.rst

@@ -14,4 +14,5 @@ Load Balancer Resources
    v2/provider
    v2/flavor_profile
    v2/flavor
+   v2/quota
    v2/amphora

doc/source/user/resources/load_balancer/v2/quota.rst

@@ -0,0 +1,12 @@
+openstack.load_balancer.v2.quota
+================================
+
+.. automodule:: openstack.load_balancer.v2.quota
+
+The Quota Class
+---------------
+
+The ``Quota`` class inherits from :class:`~openstack.resource.Resource`.
+
+.. autoclass:: openstack.load_balancer.v2.quota.Quota
+   :members: