typo fix

SCCS-file: tzfile.5
SCCS-SID: 8.3

tzfile.5

@@ -7,7 +7,7 @@ tzfile \- time zone information
 .SH DESCRIPTION
 The time zone information files used by
 .IR tzset (3)
-begin with the magic characters "TZif" to identify then as
+begin with the magic characters "TZif" to identify them as
 time zone information files,
 followed by a character identifying the version of the file's format
 (as of 2005, either an ASCII NUL or a '2')