Update docker configuration

configuration.rst

@@ -32,6 +32,8 @@ The configuration file must contain a set of key value pairs. At minimum you mus
 
 The user specified in the db-uri is also known as the authenticator role. For more information about the anonymous vs authenticator roles see the :ref:`roles`.
 
+.. _config_full_list:
+
 Here is the full list of configuration parameters.
 
 ======================== ======= ================= ========
@@ -65,8 +67,6 @@ role-claim-key           String  .role
 raw-media-types          String
 ======================== ======= ================= ========
 
-You can also set these configuration parameters using environment variables. They are capitalized, have a ``PGRST_`` prefix, and use underscores. For example: ``PGRST_DB_URI`` corresponds to ``db-uri``.
-
 .. _db-uri:
 
 db-uri
@@ -386,6 +386,13 @@ raw-media-types
 
    raw-media-types="image/png, text/xml"
 
+.. _env_variables_config:
+
+Environment Variables
+=====================
+
+You can also set these :ref:`configuration parameters <config_full_list>` using environment variables. They are capitalized, have a ``PGRST_`` prefix, and use underscores. For example: ``PGRST_DB_URI`` corresponds to ``db-uri`` and ``PGRST_APP_SETTINGS_*`` to ``app.settings.*``.
+
 .. _config_reloading:
 
 Configuration Reloading
@@ -397,14 +404,7 @@ To reload the configuration without restarting the PostgREST server, send a SIGU
 
   killall -SIGUSR2 postgrest
 
-To reload the config in docker:
-
-.. code:: bash
-
-  docker kill -s SIGUSR2 <container>
-
-  # or in docker-compose
-  docker-compose kill -s SIGUSR2 <service>
+This method does not reload :ref:`env_variables_config` and it will not work for reloading a Docker container configuration. In these cases, you need to restart the PostgREST server or use :ref:`in_db_config` as an alternative.
 
 .. important::