Change description to be agnostic to the number of policies.

redis.conf

@@ -811,7 +811,7 @@ replica-priority 100
 # maxmemory <bytes>
 
 # MAXMEMORY POLICY: how Redis will select what to remove when maxmemory
-# is reached. You can select among eight behaviors:
+# is reached. You can select one from the following behaviors:
 #
 # volatile-lru -> Evict using approximated LRU, only keys with an expire set.
 # allkeys-lru -> Evict any key using approximated LRU.