Updated sconsign/SConsignFile docs [skip appveyor]

The sconsign manpage had some considerably out of date claims,
updated to current usage and defaults.

The SConsignFile manpage/userguide entry was reworded, mainly
to clarify that there's one setting (the presence of env.SConsignFile
*might* suggest there could be per-env settings), but also fiddled
the wording a fair bit.  Use the same arg names as the actual
function, since those are usable as kwargs (manpage used to use
"file", function accepts "name").

Signed-off-by: Mats Wichmann <mats@linux.com>

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