Add help text about leaving the text editor

src/main/resources/messages_en.properties

@@ -172,7 +172,7 @@ citizens.editors.equipment.sheep-coloured=[[{0}]] is now coloured [[{1}]].
 citizens.editors.selection.start-prompt=There were multiple NPCs with the supplied name.<br>Please enter an id or number from the list below to select that NPC.
 citizens.editors.text.add-prompt=Enter text to add to the NPC.
 citizens.editors.text.added-entry=[[Added]] the entry [[{0}]].
-citizens.editors.text.begin=<b>Entered the text editor!
+citizens.editors.text.begin=<b>Entered the text editor! Type 'exit' to leave the editor.
 citizens.editors.text.change-page-prompt=Enter a page number to view more text entries.
 citizens.editors.text.close-talker-set=[[Close talker]] set to [[{0}]].
 citizens.editors.text.edit-begin-prompt=Enter the index of the entry you wish to edit or [[page]] to view more pages.