Also fix up Chen Guo's contacts
* src/sort.c (usage): Add a missing "of"
* THANKS: Add Chen Guo
* .mailmap: Add Chen Guo's UCLA address
<P@draigBrady.com> <P@draigBrady.com (trivial change)>
Pádraig Brady <p@draigbrady.com> <p@draigBrady.com>
<chen.guo.0625@gmail.com> <chenguo4@yahoo.com>
+<chen.guo.0625@gmail.com> <chenguo4@ucla.edu>
Charles Karney karney@pppl.gov
Charles Randall crandall@matchlogic.com
Chas. Owens chas.owens@gmail.com
+Chen Guo chen.guo.0625@gmail.com
Chip Salzenberg chip@valinux.com
Chris Clayton chris2553@googlemail.com
Chris Faylor cgf@cygnus.com
-t, --field-separator=SEP use SEP instead of non-blank to blank transition\n\
-T, --temporary-directory=DIR use DIR for temporaries, not $TMPDIR or %s;\n\
multiple options specify multiple directories\n\
- --parallel=N change the number sorts run concurrently to N\n\
+ --parallel=N change the number of sorts run concurrently to N\n\
-u, --unique with -c, check for strict ordering;\n\
without -c, output only the first of an equal run\n\
"), DEFAULT_TMPDIR);