env.example : ETHERPAD_PUBLIC_URL : incl. /p/ path

Closes #1200

env.example

@@ -97,8 +97,8 @@ TZ=UTC
 # Set etherpad-lite URL in docker local network (uncomment to enable)
 #ETHERPAD_URL_BASE=http://etherpad.meet.jitsi:9001
 
-# Set etherpad-lite public URL (uncomment to enable)
-#ETHERPAD_PUBLIC_URL=https://etherpad.my.domain
+# Set etherpad-lite public URL, including /p/ pad path fragment (uncomment to enable)
+#ETHERPAD_PUBLIC_URL=https://etherpad.my.domain/p/
 
 # Name your etherpad instance!
 ETHERPAD_TITLE=Video Chat
@@ -411,4 +411,4 @@ RESTART_POLICY=unless-stopped
 #TOOLBAR_BUTTONS=
 
 # Hide the buttons at pre-join screen. Add the buttons name separated with comma
-#HIDE_PREMEETING_BUTTONS=
+#HIDE_PREMEETING_BUTTONS=