correct spelling of error messages.

Reference: /n/sources/patch/applied/correct-spelling
Date: Fri May 20 07:11:50 CES 2005

--- /sys/src/cmd/aux/msexceltables.c	Fri May 20 07:11:29 2005
+++ /sys/src/cmd/aux/msexceltables.c	Fri May 20 07:11:26 2005
@@ -628,9 +628,9 @@
 	int w  = gint(b, 2);
 
 	if (c1 < 0)
-		sysfatal("negitive collum number (%d)\n", c1);
+		sysfatal("negative column number (%d)\n", c1);
 	if (c2 >= Nwidths)
-		sysfatal("too many collums (%d > %d)\n", c2, Nwidths);
+		sysfatal("too many columns (%d > %d)\n", c2, Nwidths);
 	w /= 256;
 
 	if (w > 100)