tar manpage improvements

[Dan Jacobson]

EXAMPLES
       tar -xvvf foo.tar
              extract foo.tar

I'd instead say "extract all the files in the archive file foo.tar
into the current directory" [<--usually]

       tar -xvvzf foo.tar.gz
              extract gzipped foo.tar.gz

I'd instead say "Do the same, but with an archive file that has been gzipped."

       tar -cvvf foo.tar foo/
              tar contents of folder foo in foo.tar

I'd instead say "copy the contents of the directory foo into an
archive called foo.tar."
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