localedef.1: Fix a typo in the manual page

- s/contants/content/

MFC after:	3 days

usr.bin/localedef/localedef.1

@@ -164,7 +164,7 @@ unless instructed otherwise by the
 .Fl D (
 BSD
 output) option.
-The contants of this directory should generally be copied into the
+The content of this directory should generally be copied into the
 appropriate subdirectory of
 .Pa /usr/share/locale
 in order the definitions to be visible to programs linked with libc.