Minor comments typo fix in src/port

Fix a comment typo in getrusage.c and add a comment in gettimeofday.c.

Index: getrusage.c
===================================================================
RCS file: /projects/cvsroot/pgsql/src/port/getrusage.c,v
retrieving revision 1.8
diff -c -r1.8 getrusage.c
*** getrusage.c 31 Dec 2004 22:03:53 -0000 1.8
--- getrusage.c 16 May 2005 04:56:00 -0000
***************
*** 1,7 ****

/*-------------------------------------------------------------------------
*
* getusage.c
! * 64-bit versions of fseeko/ftello()
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
--- 1,7 ----

/*-------------------------------------------------------------------------
*
* getusage.c
! * get information about resource utilisation
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
Index: gettimeofday.c
===================================================================
RCS file: /projects/cvsroot/pgsql/src/port/gettimeofday.c,v
retrieving revision 1.5
diff -c -r1.5 gettimeofday.c
*** gettimeofday.c 24 Jun 2004 18:53:48 -0000 1.5
--- gettimeofday.c 16 May 2005 04:56:00 -0000
***************
*** 1,4 ****
--- 1,7 ----
/*
+ * gettimeofday.c
+ * Win32 gettimeofday() replacement
+ *
* $PostgreSQL: pgsql/src/port/gettimeofday.c,v 1.5 2004/06/24 18:53:48
tgl Ex
p $
*
* Copyright (c) 2003 SRA, Inc.