chore: update apps/emqx_conf/etc/emqx_conf.conf

Co-authored-by: Zaiming (Stone) Shi <zmstone@gmail.com>

apps/emqx_conf/etc/emqx_conf.conf

@@ -1,6 +1,6 @@
 ## NOTE:
 ## The EMQX configuration is prioritized (overlayed) in the following order:
-## `cluster.hocon < emqx.conf < environment variables`.
+## `data/configs/cluster.hocon < etc/emqx.conf < environment variables`.
 
 
 node {