Merge pull request prawnpdf#977 from eitoball/fix-typo-in-prawn-image…

…s-image-method

Fix typo in description of Prawn::Images#image

lib/prawn/images.rb

@@ -22,7 +22,7 @@ module Images
     # Options:
     # <tt>:at</tt>:: an array [x,y] with the location of the top left corner of the image.
     # <tt>:position</tt>::  One of (:left, :center, :right) or an x-offset
-    # <tt>:vposition</tt>::  One of (:top, :center, :center) or an y-offset
+    # <tt>:vposition</tt>::  One of (:top, :center, :bottom) or an y-offset
     # <tt>:height</tt>:: the height of the image [actual height of the image]
     # <tt>:width</tt>:: the width of the image [actual width of the image]
     # <tt>:scale</tt>:: scale the dimensions of the image proportionally