span.rb in prawn-0.15.0

- old
+ new

@@ -6,9 +6,11 @@
 #
 # This is free software. Please see the LICENSE and COPYING files for details.
 
 module Prawn
   class Document
+    # @group Stable API
+
     # A span is a special purpose bounding box that allows a column of
     # elements to be positioned relative to the margin_box.
     #
     # Arguments:
     # +width+:: The width of the column in PDF points