PHRAS-3403 fix .env comments

.env

@@ -182,20 +182,24 @@ PHRASEANET_SETUP=1
 # Play an upgrade.
 # Avalaible values: "0" | "1"
 # @run
-PHRASEANET_UPGRADE=0
+PHRASEANET_U
+PGRADE=0
 
-# Activate maintenance mode
+# Maintenance mode
 # show an nginx unavailability message
-# Avalaible values: "0" | "1" 
+# Available values: "0" | "1" 
 # 0 - for no maintenance mode
 # 1 - for persisting maintenance mode 
+# During an upgrade, the unavailability message is automatically activated with a default message
+# "We are performing scheduled maintenance and will be back online in a few minutes."
 # @run
 PHRASEANET_MAINTENANCE=0
 
-# displaying a custom maintenance message
-# /!\ in case you use an env.local file. Remplace space with encoded character.
+# Customize the maintenance message
+# this is possible to customize the displayed maintenance message.
+# Note: space needs to be encoded with space html character, quote and double quote need to be escaped 
 # Example :
-# PHRASEANET_MAINTENANCE_MESSAGE=I&nbsp;AM&nbsp;is&nbsp;working,&nbsp;please&nbsp;wait<br/>comming&nbsp;soon.
+# PHRASEANET_MAINTENANCE_MESSAGE="<p>Under&#32;maintenance!</p><p>More&#32;information&#32;<a href=\"https://www.yoururl.fr\">here</a></p>"
 # @run
 PHRASEANET_MAINTENANCE_MESSAGE=