ExitStatus: Improve documentation re wait status vs exit status

The use of `ExitStatus` as the Rust type name for a Unix *wait
status*, not an *exit status*, is very confusing, but sadly probably
too late to change.

This area is confusing enough in Unix already (and many programmers
are already confuxed).  We can at least document it.

I chose *not* to mention the way shells like to exit with signal
numbers, thus turning signal numbers into exit statuses.  This is only
relevant for Rust programs using `std::process` if they run shells.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

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