Fix descriptions of Etcd3GW driver

add it to driver compatibility matrix, and mention it also
supporting grouping API, not only distributed locks.

Change-Id: I24c5e8ca6b7304f75e17d8346ab288b55ca4e1e8
Closes-Bug: #2144040
Signed-off-by: Pavlo Shchelokovskyy <shchelokovskyy@gmail.com>

doc/source/user/compatibility.rst

@@ -33,6 +33,8 @@ Driver support
      - Yes
    * - :py:class:`~tooz.drivers.etcd.EtcdDriver`
      - Yes
+   * - :py:class:`~tooz.drivers.etcd3gw.Etcd3Driver`
+     - Yes
    * - :py:class:`~tooz.drivers.file.FileDriver`
      - Yes
    * - :py:class:`~tooz.drivers.ipc.IPCDriver`
@@ -73,6 +75,8 @@ Driver support
      - No
    * - :py:class:`~tooz.drivers.etcd.EtcdDriver`
      - No
+   * - :py:class:`~tooz.drivers.etcd3gw.Etcd3Driver`
+     - No
    * - :py:class:`~tooz.drivers.file.FileDriver`
      - No
    * - :py:class:`~tooz.drivers.ipc.IPCDriver`
@@ -110,6 +114,8 @@ Driver support
      - Yes
    * - :py:class:`~tooz.drivers.etcd.EtcdDriver`
      - Yes
+   * - :py:class:`~tooz.drivers.etcd3gw.Etcd3Driver`
+     - Yes
    * - :py:class:`~tooz.drivers.file.FileDriver`
      - Yes
    * - :py:class:`~tooz.drivers.ipc.IPCDriver`

doc/source/user/drivers.rst

@@ -202,10 +202,9 @@ Etcd3 Gateway
 
 **Summary:**
 
-The etcd3gw driver is a driver providing only distributed locks (for now)
-and is based on the `etcd server`_ supported key/value storage and
-associated primitives. It relies on the `GRPC Gateway`_ to provide HTTP access
-to etcd3.
+The etcd3gw driver is a driver providing distributed locking and grouping APIs
+and is based on the `etcd server`_ supported key/value storage and associated
+primitives. It relies on the `GRPC Gateway`_ to provide HTTP access to etcd3.
 
 Consul
 ------