[doc] Remove freezer-dr reference

Since freezer-dr has been retired [1] we remove all references to this
part of Freezer service from documentation.

[1] https://review.opendev.org/q/topic:%22freezer/retire_dr%22

Change-Id: Ide1d4ac7ad81e8ac89bdfe039838023ce621878c

doc/README.rst

@@ -19,7 +19,7 @@ NOTE
 Freezer has four different components; Freezer Web UI, Freezer Scheduler,
 Freezer Agent and Freezer API.
 
-If you need to use Freezer Backup Restore DR as a Service platform, you need to
+If you need to use Freezer Backup Restore as a Service platform, you need to
 install Freezer Scheduler, Freezer Agent on client and Freezer Web UI, Freezer
 API on OpenStack controller server.
 (The server where your Horizon and Keystone installed)
@@ -38,7 +38,7 @@ https://github.com/openstack/freezer-api
 Features
 ========
 
-Freezer is a Backup Restore DR as a Service platform that helps you to automate
+Freezer is a Backup Restore as a Service platform that helps you to automate
 the data backup and restore process.
 
 The following features are available:

doc/source/install/get_started.rst

@@ -1,6 +1,6 @@
-Backup/Restore and DR service overview
-======================================
-The Backup/Restore and DR service provides an easy way to backup and restore
+Backup/Restore service overview
+===============================
+The Backup/Restore service provides an easy way to backup and restore
  your OpenStack workloads to different storage.
 
 The Backup and restore service consists of the following components:
@@ -8,9 +8,6 @@ The Backup and restore service consists of the following components:
  - freezer-agent
  - freezer-scheduler
 
-The Disaster Recovery service consists of the following components:
- - freezer-dr
-
 The service features a RESTful API, which can be used to maintain the status of
 your jobs, backups and metadata.
 
@@ -23,7 +20,9 @@ Concepts and definitions
 
 
 ``freezer-api`` service
-  Accepts and responds to end user API calls...
+  Accepts and responds to end user API calls.
+  ``freezer-api`` service documentation can be found here:
+  `Freezer API <https://docs.openstack.org/freezer-api/latest/>`_
 
 
 ``freezer-scheduler`` service
@@ -36,11 +35,6 @@ Concepts and definitions
   gets called by ``freezer-scheduler`` to execute backups/restore operations.
 
 
-``freezer-dr`` service
-  Independent service from all other freezer services. It runs on the control
-  plane to do disaster recovery in case of any compute node failed (more to
-  follow)
-
 *hostname* is _probably_ going to be the host fqdn.
 
 *backup_id* defined as UUID of a backup.

doc/source/install/index.rst

@@ -1,5 +1,5 @@
-Backup/Restore and DR service
-=============================
+Backup/Restore service
+======================
 
 .. toctree::
    :maxdepth: 2