Export Close VideoFrame as it is used in mediacapture-transform spec

Author: youennf

index.src.html

@@ -4006,7 +4006,7 @@
             in |clone|.
     2. Return |clone|.
 
-: <dfn>Close VideoFrame</dfn> (with |frame|)
+: <dfn export>Close VideoFrame</dfn> (with |frame|)
 :: 1. Assign `null` to |frame|'s {{VideoFrame/[[resource reference]]}}.
     2. Assign `true` to |frame|'s {{platform object/[[Detached]]}}.
     3. Assign `null` to |frame|'s {{VideoFrame/format}}.