Minor changes in demo and installation docs (#92)

Minor changes in `demo` and `installation` docs

Description
Update installation.rst and demo.rst docs
Resolves: #85

Reviewed-by: Anton Sidelnikov <None>

Author: lego963

doc/source/examples/demo.rst

@@ -12,14 +12,14 @@ perform invoke Terraform to query image_id for the image by name.
 
   .. code-block:: console
 
-     wget https://github.com/opentelekomcloud/vault-plugin-secrets-openstack/releases/download/v1.0.2/vault-plugin-secrets-openstack_1.0.2_linux_amd64.tar.gz
-     tar xvf vault-plugin-secrets-openstack_1.0.2_linux_arm64.tar.gz -C /opt/vault/plugins
+     $ wget https://github.com/opentelekomcloud/vault-plugin-secrets-openstack/releases/download/v1.1.2/vault-plugin-secrets-openstack_1.1.2_linux_amd64.tar.gz
+     $ tar xvf vault-plugin-secrets-openstack_1.1.2_linux_amd64.tar.gz -C /opt/vault/plugins
 
 - Register the plugin
 
   .. code-block::
 
-     vault secrets enable -path="openstack" -plugin-name="vault-plugin-secrets-openstack" plugin
+     $ vault secrets enable -path="openstack" -plugin-name="vault-plugin-secrets-openstack" plugin
 
 - Register password policy
 
@@ -46,20 +46,20 @@ perform invoke Terraform to query image_id for the image by name.
 
   .. code-block:: console
 
-     vault write sys/policies/password/os-policy policy=@os_policy.hcl
+     $ vault write sys/policies/password/os-policy policy=@os_policy.hcl
 
 
 - Configure cloud root account
 
   .. code-block::
 
-     vault write openstack/cloud/demo auth_url=https://<AUTH_URL> username=<USER> password=<PASSWORD> user_domain_name=<USER_DOMAIN_NAME> password_policy=os-policy
+     $ vault write openstack/cloud/demo auth_url=https://<AUTH_URL> username=<USER> password=<PASSWORD> user_domain_name=<USER_DOMAIN_NAME> password_policy=os-policy
 
 - Configure root token role
 
   .. code-block:: console
 
-     vault write /openstack/role/root_token cloud=demo project_name=<PROJECT_NAME> domain_name=<DOMAIN_NAME> root=true
+     $ vault write /openstack/role/root_token cloud=demo project_name=<PROJECT_NAME> domain_name=<DOMAIN_NAME> root=true
 
 - Prepare Terraform configuration
 
@@ -79,4 +79,4 @@ perform invoke Terraform to query image_id for the image by name.
 
   .. code-block:: console
 
-     terraform apply
+     $ terraform apply

doc/source/installation.rst

@@ -12,8 +12,8 @@ the repository or it can be built from sources.
 
 .. code-block:: console
 
-   $ wget https://github.com/opentelekomcloud/vault-plugin-secrets-openstack/releases/download/v1.0.1/vault-plugin-secrets-openstack_1.0.1_linux_arm64.tar.gz
-   $ tar xvf vault-plugin-secrets-openstack_1.0.1_linux_arm64.tar.gz -C /etc/vault/plugins
+   $ wget https://github.com/opentelekomcloud/vault-plugin-secrets-openstack/releases/download/v1.0.1/vault-plugin-secrets-openstack_1.1.2_linux_arm64.tar.gz
+   $ tar xvf vault-plugin-secrets-openstack_1.1.2_linux_amd64.tar.gz -C /etc/vault/plugins
 
 Once the plugin is unpacked into the location expected by Vault the server
 should be restarted.
@@ -25,6 +25,13 @@ should be restarted.
 After that it is possible to register the plugin and proceed with the
 configuration.
 
+.. code-block:: console
+
+   $ export SHA256=$(shasum -a 256 "/etc/vault/plugins/vault-plugin-secrets-openstack" | cut -d' ' -f1)
+   $ vault plugin register -sha256="${SHA256}" secret vault-plugin-secrets-openstack
+
+Now we need to enable the plugin.
+
 .. code-block:: console
 
    $ vault secrets enable \