chore: rename emqx-example-en.conf to emqx-example.conf

mix.exs

@@ -331,7 +331,7 @@ defmodule EMQXUmbrella.MixProject do
 
     Mix.Generator.copy_file(
       "apps/emqx_dashboard/etc/emqx.conf.en.example",
-      Path.join(etc, "emqx-example-en.conf"),
+      Path.join(etc, "emqx-example.conf"),
       force: overwrite?
     )
 

rebar.config.erl

@@ -401,7 +401,7 @@ etc_overlay(ReleaseType, Edition) ->
     [
         {mkdir, "etc/"},
         {copy, "{{base_dir}}/lib/emqx/etc/certs", "etc/"},
-        {copy, "apps/emqx_dashboard/etc/emqx.conf.en.example", "etc/emqx-example-en.conf"}
+        {copy, "apps/emqx_dashboard/etc/emqx.conf.en.example", "etc/emqx-example.conf"}
     ] ++
         lists:map(
             fun