dired-do-copy's Help doesn't mention magic characters

[Dan Jacobson]

dired-do-copy's Help doesn't mention the use of $ in the target file
name.  E.g. I told it to copy to foo$$ and it copies to foo$, I told
it foo$$$ and I get an error, I told it foo$$$$ and I get foo$$.
Nowhere do I get $$ to be the shell PID... that's OK though, as long
as the Help string describes what the deal is with $, etc. and
any other surprises ["!"?] on board.
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