doc: add info about RRL and Cookies configuration order

doc/configuration.rst

@@ -604,7 +604,7 @@ an identifier must be created and then referenced in the form of
    Query modules are processed in the order they are specified in the
    zone/template configuration. In most cases, the recommended order is::
 
-      mod-synthrecord, mod-onlinesign, mod-rrl, mod-dnstap, mod-stats
+      mod-synthrecord, mod-onlinesign, mod-cookies, mod-rrl, mod-dnstap, mod-stats
 
 Performance Tuning
 ==================

src/knot/modules/cookies/cookies.rst

@@ -16,7 +16,8 @@ support DNS Cookies, otherwise they are not used.
 
 .. WARNING::
    For effective module operation the :ref:`RRL<mod-rrl>` module must also
-   be enabled.
+   be enabled and configured after :ref:`Cookies<mod-cookies>`. See
+   :ref:`query-modules` how to configure modules.
 
 Example
 -------