Change history of yao documentation

Rev	Date	Modified by	Minor edit	Spam	WikiText	Revert to
6	2014-06-01 07:58:32	dkf	no	no	6	6
5	2008-08-25 17:35:55	wdb	no	no	5	5
4	2008-08-25 17:35:15	wdb	no	no	4	4
3	2008-08-23 11:22:49	wdb	no	no	3	3
2	2008-08-23 10:51:16	wdb	no	no	2	2
1	2008-08-23 10:47:53	wdb	no	no	1	1
0	2008-08-23 10:17:23	wdb	no	no	0	0