* lisp/image.el (insert-image, insert-sliced-image): Doc fix.

lisp/ChangeLog

+2012-11-18  Glenn Morris  <rgm@gnu.org>
+
+	* image.el (insert-image, insert-sliced-image): Doc fix.
+
 2012-11-17  Chong Yidong  <cyd@gnu.org>
 	* emacs-lisp/syntax.el (syntax-propertize-function): Doc fix

lisp/image.el

@@ -432,7 +432,7 @@ means display it in the right marginal area."
   "Insert IMAGE into current buffer at point.
 IMAGE is displayed by inserting STRING into the current buffer
 with a `display' property whose value is the image.  STRING
-defaults to the empty string if you omit it.
+defaults to a single space if you omit it.
 AREA is where to display the image.  AREA nil or omitted means
 display it in the text area, a value of `left-margin' means
 display it in the left marginal area, a value of `right-margin'
@@ -470,8 +470,8 @@ height of the image; integer values are taken as pixel values."
 (defun insert-sliced-image (image &optional string area rows cols)
   "Insert IMAGE into current buffer at point.
 IMAGE is displayed by inserting STRING into the current buffer
-with a `display' property whose value is the image.  STRING is
-defaulted if you omit it.
+with a `display' property whose value is the image.  The default
+STRING is a single space.
 AREA is where to display the image.  AREA nil or omitted means
 display it in the text area, a value of `left-margin' means
 display it in the left marginal area, a value of `right-margin'