org.texi: Fix export snippet syntax in ODT backend

* doc/org.texi (Creating one-off styles): Use new export snippet
  syntax.

doc/org.texi

@@ -12543,13 +12543,13 @@ file.  The use of this feature is better illustrated with couple of examples.
 @enumerate
 @item Embedding ODT tags as part of regular text
 
-You can include simple OpenDocument tags by prefixing them with
-@samp{@@}.  For example, to highlight a region of text do the following:
+You can inline OpenDocument syntax by enclosing it within
+@samp{@@@@odt:...@@@@} markup.  For example, to highlight a region of text do
+the following:
 
 @example
-@@<text:span text:style-name="Highlight">This is a
-highlighted text@@</text:span>.  But this is a
-regular text.
+@@@@odt:<text:span text:style-name="Highlight">This is a highlighted
+text</text:span>@@@@.  But this is a regular text.
 @end example
 
 @strong{Hint:} To see the above example in action, edit your