Improvements to --progress in man page

[Matt McCutchen]

Attached is a patch that improves the discussion of --progress in the
rsync man page.  It makes one badly needed update: the man page needs
to use "(xfer#5, to-check=169/396)" instead of "(5, 57.1% of 396)".
In addition, I tried to make the rest of the discussion more precise.

Matt
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