* tzfile.5: Fix prefix/suffix typo (thanks to Ian Abbott).

tzfile.5

@@ -134,7 +134,7 @@ bytes that represent time zone designations,
 which are null-terminated byte strings, each indexed by the
 .B tt_desigidx
 values mentioned above.
-The byte strings can overlap if one is a prefix of the other.
+The byte strings can overlap if one is a suffix of the other.
 The encoding of these strings is not specified.
 .IP *
 .B tzh_leapcnt