docs(ssl_dist.conf): update doc link

apps/emqx/etc/ssl_dist.conf

@@ -1,6 +1,6 @@
 %% This additional config file is used when the config 'cluster.proto_dist' in emqx.conf is set to 'inet_tls'.
 %% Which means the EMQX nodes will connect to each other over TLS.
-%% For more information about inter-broker security, see: https://docs.emqx.com/en/enterprise/v5.0/deploy/cluster/security.html
+%% For more information about inter-broker security, see: https://docs.emqx.com/en/enterprise/v5.3/deploy/cluster/security.html
 
 %% For more information in technical details see: http://erlang.org/doc/apps/ssl/ssl_distribution.html