Add TCF page doc (#4613)

Resolves #4560

Author: p7nov

doc/tooling/tcm/_images/tcm_ui_tcf.png

@@ -20,4 +20,5 @@ to learn how to perform various management operations on Tarantool clusters from
     tcm_cluster_security
     tcm_cluster_metrics
     tcm_supervised_failover
-    tcm_cluster_migrations
+    tcm_cluster_migrations
+    tcm_cluster_tcf

doc/tooling/tcm/tcm_cluster_management/index.rst

@@ -0,0 +1,23 @@
+..  _tcm_cluster_tcf:
+
+TCF integration
+===============
+
+..  include:: ../index.rst
+    :start-after: ee_note_tcm_start
+    :end-before: ee_note_tcm_end
+
+|tcm_full_name| provides a web interface for clusters that run within `Tarantool Clusters Federation <https://www.tarantool.io/en/clustersfederation/>`__.
+It is available on the **Cluster** > **TCF** page. If a connected cluster is
+configured to run in a TCF installation, this page shows information about both
+clusters in this installation: their ID's, names, and statuses. To switch cluster
+states in TCF, click **Toggle** on the **TCF** page.
+
+To learn more about Tarantool Clusters Federation, see `its documentation <https://www.tarantool.io/en/clustersfederation/doc/latest/>`__.
+
+.. note::
+
+    For individual clusters, the **TCF** page is empty.
+
+
+

doc/tooling/tcm/tcm_cluster_management/tcm_cluster_tcf.rst

@@ -46,4 +46,14 @@ Cluster security settings
 Since version 1.2.2, |tcm| provides a web interface for managing cluster security settings
 on the **Security** page in the **Cluster** group.
 
-Learn more about managing cluster security from |tcm| in :ref:`tcm_cluster_security`.
+Learn more about managing cluster security from |tcm| in :ref:`tcm_cluster_security`.
+
+.. _tcm_releases_1_2_tcf:
+
+TCF integration
+---------------
+
+Since version 1.2.2, |tcm| includes a page for managing clusters that
+run within `Tarantool Clusters Federation <https://www.tarantool.io/en/clustersfederation/>`__.
+
+Learn more about working with TCF in |tcm| in :ref:`tcm_cluster_tcf`.

doc/tooling/tcm/tcm_releases/tcm_1.2.rst

@@ -199,6 +199,7 @@ The **Migrations** page provides centralized migration management tools for the
     :alt: TCM cluster migrations page
 
 Learn more in :ref:`tcm_cluster_migrations`.
+
 ..  _tcm_ui_cluster_tuples:
 
 Tuples
@@ -222,6 +223,25 @@ On this page, you can:
 -   view the list of user spaces, their size and engines
 -   view and edit tuples stored in user spaces
 
+..  _tcm_ui_cluster_tcf:
+
+TCF
+~~~
+
+The **TCF** page provides an interface for clusters that run within `Tarantool Clusters Federation <https://www.tarantool.io/en/clustersfederation/>`__.
+
+.. image:: _images/tcm_ui_tcf.png
+    :align: left
+    :width: 700
+    :alt: TCM TCF page
+
+On this page, you can:
+
+-   view information about TCF clusters
+-   switch cluster states in a TCF installation
+
+Learn more in :ref:`tcm_cluster_tcf`.
+
 ..  _tcm_ui_cluster_metrics:
 
 Cluster metrics