Merge pull request #862 from AOMediaCodec/sunghee-hwang-patch-1

The missed properties during merging PR #833

Author: sunghee-hwang

index.bs

@@ -37,6 +37,9 @@ url: https://www.iso.org/standard/83102.html#; spec: ISO-BMFF; type: property;
 	text: ctts
 	text: stss
 	text: btrt
+	text: mdhd
+	text: elng
+
 
 url: https://aomediacodec.github.io/av1-spec/av1-spec.pdf#; spec: AV1-Spec; type: dfn;
 	text: Clip3