Improve a comment in env.*.eex for releases (#9134)

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>

Author: whatyouhide

lib/mix/lib/mix/tasks/release.init.ex

@@ -66,7 +66,9 @@ defmodule Mix.Tasks.Release.Init do
     #   export ELIXIR_ERL_OPTIONS="-heart"
     # fi
 
-    # Set the release to work across nodes
+    # Set the release to work across nodes. If using the long name format like
+    # the one below (my_app@127.0.0.1), you need to also uncomment the
+    # RELEASE_DISTRIBUTION variable below.
     # export RELEASE_DISTRIBUTION=name
     # export RELEASE_NODE=<%= @release.name %>@127.0.0.1
     """
@@ -230,7 +232,9 @@ defmodule Mix.Tasks.Release.Init do
   def env_bat_text,
     do: ~S"""
     @echo off
-    rem Set the release to work across nodes
+    rem Set the release to work across nodes. If using the long name format like
+    rem the one below (my_app@127.0.0.1), you need to also uncomment the
+    rem RELEASE_DISTRIBUTION variable below.
     rem set RELEASE_DISTRIBUTION=name
     rem set RELEASE_NODE=<%= @release.name %>@127.0.0.1
     """