Correct the comment for FC_LANG in fontconfig.h
diff --git a/fontconfig/fontconfig.h b/fontconfig/fontconfig.h
index af870d0..b309478 100644
--- a/fontconfig/fontconfig.h
+++ b/fontconfig/fontconfig.h
@@ -108,7 +108,7 @@
#define FC_MINSPACE "minspace" /* Bool use minimum line spacing */
#define FC_SOURCE "source" /* String (deprecated) */
#define FC_CHARSET "charset" /* CharSet */
-#define FC_LANG "lang" /* String RFC 3066 langs */
+#define FC_LANG "lang" /* LangSet Set of RFC 3066 langs */
#define FC_FONTVERSION "fontversion" /* Int from 'head' table */
#define FC_FULLNAME "fullname" /* String */
#define FC_FAMILYLANG "familylang" /* String RFC 3066 langs */
