inconvenient "back" in Help

[Dan Jacobson]

If a Help message is big, the user will get frustrated having to go
all the way to the bottom of the file to find the "back" link.

I do (list-character-sets nil), I select e.g. chinese-cns11643-7.  OK,
I am thru looking at all its boxes.  I want to go back.  I must go all
the way to the bottom of this big buffer to find the "back" link.
Even in the menus I find no "back" shortcut.   At least another "back"
link should be added also to the top of each page, or some mouse key
should be assigned and put into the help menu where we would see it
and also see how to invoke "back" with just a mousestroke.
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