MFp4:

Add a new option to newfs(8), -r, to specify reserved space at the
end of the device.  It can be useful, e.g., when the device is to
become a member of a gmirror array later w/o losing the file system
on it.

Document the new option in the manpage.

While I'm here, improve error handling for -s option, which is
syntactically similar to -r; and document the fact that -s0 selects
the default fs size explicitly, which can be useful, e.g., in a
menu-based wrapper around newfs(8) requiring some value be entered
for the fs size.

Also fix a small typo in the help line for -s (missing space).

Idea and initial implementation by:	marck
Discussed on:				-fs
Critical review by:			bde
Tested with:				cmp(1)

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