doc: write about integrity check in tcm

Author: mar

doc/tooling/tcm/tcm_integrity_check.rst

@@ -16,25 +16,6 @@ This mechanism allows TCM to:
 * Allows updating the configuration with integrity check support.
 * Detect unauthorized changes in centralized configuration.
 
-..  _tcm_integrity_check_enable:
-
-Enabling integrity check
-------------------------
-
-To enable integrity checks, you must sign the application and configuration:
-
-#. Package the application with integrity checks:
-
-    .. code-block:: console
-
-        tt pack --with-integrity-check
-
-#. Publish configuration with integrity metadata:
-
-    .. code-block:: console
-
-        tt cluster publish --with-integrity-check
-
 ..  _tcm_integrity_check_configure:
 
 Configure integrity check
@@ -79,23 +60,11 @@ Example configuration
 ~~~~~~~~~~~~~~~~~~~~~
 
 Integrity check in |tcm| can be enabled and customized using several methods.
-You can configure it directly in the |tcm| configuration file or through environment variables when starting the application.
-
-* In configuration file:
-
-    .. code-block:: yaml
-
-        # tcm.yaml
-        security:
-            integrity-check: true
-            signature-private-key-file: /etc/tcm/private_key.pem
-
-
-* Environment variables:
-
-    .. code-block:: console
+You can configure it directly in the |tcm| configuration file:
 
-        export TCM_SECURITY_INTEGRITY_CHECK=true
-        export TCM_SECURITY_SIGNATURE_PRIVATE_KEY_FILE=/etc/tcm/private_key.pem
+.. code-block:: yaml
 
-        tt --integrity-check /etc/tcm/public_key.pem start tcm
+    # tcm.yaml
+    security:
+        integrity-check: true
+        signature-private-key-file: /etc/tcm/private_key.pem