Suggestion: minor change to TUTORIAL(.*)

[CHENG Gao]

In TUTORIAL, line 42-45 (latest cvs source): 

,----
|       C-l     Clear screen and redisplay all the text,
|                moving the text around the cursor
|                to the center of the screen.
|                (That's CONTROL-L, not CONTROL-1.)
`----
Certainly Ctrl-L is not Ctrl-l.
How about changing to:
,----
| (Here l is lower case of L.)
`----

This affects all TUTORIAL.* files.

Another minor problem is copyright year in TUTORIAL.cn should be updated
to add 2006. TUTORIAL.cn is the only tutoril file missing 2006.