Change history of Tcl Tutorial Lesson 6a

Rev	Date	Modified by	Minor edit	Spam	WikiText	Revert to
4	2019-02-01 20:03:19	msi	yes	no	4	4
3	2017-09-11 04:18:19	arjen	no	no	3	3
2	2017-06-15 17:19:38	arjen	no	no	2	2
1	2017-06-12 06:55:53	arjen	no	no	1	1
0	2017-06-12 06:53:43	arjen	no	no	0	0