Fix the misleading description of the option repl-ping-slave-period
@@ -641,7 +641,7 @@ repl-diskless-sync-max-replicas 0
# you risk an OOM kill.
repl-diskless-load disabled
-# Replicas send PINGs to server in a predefined interval. It's possible to
+# Master send PINGs to its replicas in a predefined interval. It's possible to
# change this interval with the repl_ping_replica_period option. The default
# value is 10 seconds.
#
