Tutorial needs to be updated to the C-l change

[Thomas Hühn]

Hi

When starting the Emacs tutorial (today's git version) it greets me with a
big red warning that some basic editing commands have been changed.

   Standard Key   Command                     In Your Emacs   
   C-l            recenter                    M-x recenter     more info

Please adjust the tutorial so that it knows about the change in the binding
of C-l to "recenter-top-bottom".

Thomas