Ensure etcd is in developer and driver docs

Change-Id: I2da690a7ea93646e38d86f90168571abaab69067

doc/source/developers.rst

@@ -9,7 +9,7 @@ Interfaces
    :members:
 
 Etcd
-~~~
+~~~~
 
 .. autoclass:: tooz.drivers.etcd.EtcdDriver
    :members:

doc/source/drivers.rst

@@ -183,11 +183,27 @@ Considerations
 - Does **not** work when MySQL replicates from one server to another (locks
   are local to the server that they were created from).
 
+Etcd
+----
+
+**Driver:**  :py:class:`tooz.drivers.etcd.EtcdDriver`
+
+**Characteristics:** :py:attr:`tooz.drivers.etcd.EtcdDriver.CHARACTERISTICS`
+
+**Entrypoint name:** ``etcd``
+
+**Summary:**
+
+The etcd driver is a driver providing only distributed locks (for now)
+and is based on the `etcd server`_ supported key/value storage and
+associated primitives.
+
 Characteristics
 ---------------
 
 .. autoclass:: tooz.coordination.Characteristics
 
+.. _etcd server: https://coreos.com/etcd/
 .. _advisory locks: http://www.postgresql.org/docs/8.2/interactive/\
                     explicit-locking.html#ADVISORY-LOCKS
 .. _get_lock: http://dev.mysql.com/doc/refman/5.5/en/\