Fix documents in doc/source/install

* Fix release version name
  because I think the latest release(Stein)
  needs to be applied to these documents.
* Fix list number(trivial)

Change-Id: I5973f14696975c757ee8d0fc264a25f85c2e4585
Co-Authored-By: Akihiro Motoki <amotoki@gmail.com>

doc/source/install/from-source.rst

@@ -14,7 +14,9 @@ Installation
 .. note::
 
   In the commands below, substitute "<release>" for your version of choice,
-  such as "ocata" or "pike".
+  such as "queens" or "rocky".
+
+  If you use the development version, replace "stable/<release>" with "master".
 
 #. Clone Horizon
 

doc/source/install/install-debian.rst

@@ -55,7 +55,7 @@ Install and configure components
 
 
 
-2. Edit the
+3. Edit the
    ``/etc/openstack-dashboard/local_settings.py``
    file and complete the following actions:
 

doc/source/install/system-requirements.rst

@@ -2,7 +2,7 @@
 System Requirements
 ===================
 
-The Queens release of horizon has the following dependencies.
+The Stein release of horizon has the following dependencies.
 
 * Python 2.7 or 3.5
 * Django 1.11 or 2.0
@@ -16,7 +16,7 @@ The Queens release of horizon has the following dependencies.
 * An accessible `keystone <https://docs.openstack.org/keystone/latest/>`_ endpoint
 
 * All other services are optional.
-  Horizon supports the following services as of the Queens release.
+  Horizon supports the following services as of the Stein release.
   If the keystone endpoint for a service is configured,
   horizon detects it and enables its support automatically.