org.texi (History and Acknowledgments): Fix typo

* org.texi (History and Acknowledgments): Fix typo.

doc/org.texi

@@ -16656,7 +16656,7 @@ let me know what I am missing here!
 
 @section From Bastien
 
-I (Bastien) have been maintaining Org since January 2010.  This appendix
+I (Bastien) have been maintaining Org since January 2011.  This appendix
 would not be complete without adding a few more acknowledgements and thanks
 to Carsten's ones above.