Add info to dunstrc

Add notes specifying the changes after 1.11

Author: bynect

dunstrc

@@ -32,11 +32,15 @@
     height = (0, 300)
     # constant height of 300
     # height = 300
+    # NOTE: Dunst from version 1.11 and older don't support dynamic height
+    #       and the given value is treated as the maximum height
 
     # Position the notification in the top right corner
     origin = top-right
 
     # Offset from the origin
+    # NOTE: Dunst from version 1.11 and older use this alternative notation
+    # offset = 10x50
     offset = (10, 50)
 
     # Scale factor. It is auto-detected if value is 0.