[Bug-tar] minor error in "Format of the Incremental Snapshot Files" node

[Nathan Stratton Treadway]

I recently noticed a small error in the "Format of the Incremental
Snapshot Files" node of the GNU tar documentation (e.g.
  http://www.gnu.org/software/tar/manual/html_node/Snapshot-Files.html
).

In that node, the description of the Format 0 "nfs" field says 

  A single plus character (+), if this directory is located on an
  NFS-mounted partition, or a single space otherwise;"

, but based on an old version 0 snapshot file I have lying around as
well as the "read_incr_db_01" function from incremen.c, I think that if
the file was not NFS mounted then there is no character at all in that
field.  (That is, on lines for non-NFS directories, the first character
in the line is simply the first character of the device number field...)

Thanks.

                                        Nathan
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