DOC: update whats new note

Author: jklymak

doc/users/next_whats_new/fig_draw_no_output.rst

@@ -3,6 +3,8 @@ Figure now has draw_no_output method
 
 Rarely, the user will want to trigger a draw without making output to 
 either the screen or a file.  This is useful for determining the final 
-position of artists on the figure that require a draw like text.
-This could be accomplished via ``fig.canvas.draw()`` but that is 
-not user-facing, so a new method on `.Figure.draw_no_output` is provided.  
+position of artists on the figure that require a draw, like text artists.
+This could be accomplished via ``fig.canvas.draw()`` but has side effects,
+sometimes requires an open file, and is documented on an object most users 
+do not need to access.  The `.Figure.draw_no_output` is provided to trigger 
+a draw without pushing to the final output, and with fewer side effects.