Thread: pgsql: Better document win32_open and its ability to allow concurrent

Log Message:
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Better document win32_open and its ability to allow concurrent
unlink/rename().

Modified Files:
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    pgsql/src/port:
        dirmod.c (r1.29 -> r1.30)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/port/dirmod.c.diff?r1=1.29&r2=1.30)
        open.c (r1.4 -> r1.5)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/port/open.c.diff?r1=1.4&r2=1.5)