Remove 'see how to play' from the manpage

> The manpage (which is very nice!) says at the end of the description "See HOW
TO PLAY for more details."  This seems to point to another file (several
manpages do that, which I find really annoying), but actually points to another
section in the manpage.  That is normal for a manpage: first a short
description, then the commandline arguments, then more details.  I would remove
this line from the end of the short description, to avoid confusion.

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Let's do a new version.