[UG] Fix a typo in Environment commands section

Closes-Bug: #1614545
Change-Id: I31d26f5422537d9dbe3aa95df08011d498a38da3

userdocs/fuel-user-guide/cli/cli_environment.rst

@@ -1,7 +1,8 @@
 .. _cli-environment:
 
+====================
 Environment commands
---------------------
+====================
 
 The following table describes environment management commands
 available in the Fuel CLI.
@@ -17,28 +18,27 @@ available in the Fuel CLI.
      - ``fuel env``
      -
    * - Create an environment.
-     - ``fuel env create --name <env_name> --rel <release_number>``
+     - ``fuel env create --name <ENV_NAME> --rel <RELEASE_NUMBER>``
      - By default, Fuel creates an OpenStack environment in the
        ``multinode`` mode, and the ``nova`` network mode.
        To specify other modes, you can add optional arguments:
 
-       ::
+       .. code-block:: console
 
-        fuel env create --name <env_name> --rel <release_number> \
+        fuel env create --name <ENV_NAME> --rel <RELEASE_NUMBER> \
         --mode ha --network-mode neutron --net-segment-type vlan
 
        Use the ``set`` action to change the name, mode, or network mode
        for an OpenStack environment:
 
-       ::
+       .. code-block:: console
 
-        fuel --env <env_id> env set --name <NewEmvName> --mode ha_compact
+        fuel --env <ENV_ID> env set --name <NEW_ENV_NAME> --mode ha_compact
 
    * - Delete an OpenStack environment.
-     - ``fuel --env <env_id> env delete``
+     - ``fuel --env <ENV_ID> env delete``
      -
    * - Update the OpenStack environment to a newer version. To roll back a
        failed update, use the same command with the previous release number.
-     - ``fuel env --update --env <env_id> --rel <release_number>``
+     - ``fuel env --update --env <ENV_ID> --rel <RELEASE_NUMBER>``
      -
-