Fix link in box.cfg.replication_anon reference (#4489)

Fixes #2534

Author: p7nov

doc/reference/configuration/cfg_replication.rst

@@ -74,7 +74,7 @@
 
     A Tarantool replica can be anonymous. This type of replica
     is read-only (but you still can write to temporary and
-    replica-local spaces), and it isn't present in the ``_cluster`` table.
+    replica-local spaces), and it isn't present in the :ref:`_cluster <box_space-cluster>` space.
 
     Since an anonymous replica isn't registered in the ``_cluster`` table,
     there is no limitation for anonymous replicas count in a replica set:

doc/reference/configuration/configuration_reference.rst

@@ -3525,7 +3525,7 @@ The ``replication`` section defines configuration parameters related to :ref:`re
 
     ..  NOTE::
 
-        Anonymous replicas are not registered in the :ref:`_cluster <box_space-cluster>` table.
+        Anonymous replicas are not registered in the :ref:`_cluster <box_space-cluster>` space.
         This means that there is no :ref:`limitation <limitations_replicas>` on the number of anonymous replicas in a replica set.
 
     |