Clarify user_limit variable

.env.dist

@@ -38,7 +38,7 @@ PLEROMA_NAME=
 PLEROMA_ADMIN_EMAIL=
 
 # User settings
-PLEROMA_USER_LIMIT=
+PLEROMA_MAX_TOOT_CHARS=
 PLEROMA_REGISTRATIONS_OPEN=
 
 # Media proxy

docker-compose.m4

@@ -49,7 +49,7 @@ services:
       env(`pleroma_secret_key_base')
       env(`pleroma_name')
       env(`pleroma_admin_email')
-      env(`pleroma_user_limit')
+      env(`pleroma_max_toot_chars')
       env(`pleroma_registrations_open')
       env(`pleroma_media_proxy_enabled')
       env(`pleroma_media_proxy_redirect_on_failure')

docker-config.exs

@@ -31,7 +31,7 @@ config :pleroma, :chat,
 config :pleroma, :instance,
     name: Docker.env(:name),
     email: Docker.env(:admin_email),
-    limit: Docker.env(:user_limit),
+    limit: Docker.env(:max_toot_chars),
     registrations_open: Docker.env(:registrations_open)
 
 config :pleroma, :media_proxy,