Fix indent on steps.

Author: dalecurtis

index.src.html

@@ -5740,8 +5740,8 @@
         1. Remove all entries from {{ImageDecoder/[[ImageTrackList]]}}.
         2. Assign `-1` to {{ImageDecoder/[[ImageTrackList]]}}'s
             {{ImageTrackList/[[selected index]]}}.
-   4. If {{ImageDecoder/[[complete]]}} is false resolve
-        {{ImageDecoder/[[completed promise]]}} with |exception|.
+    4. If {{ImageDecoder/[[complete]]}} is false resolve
+	{{ImageDecoder/[[completed promise]]}} with |exception|.
 
 ImageDecoderInit Interface {#imagedecoderinit-interface}
 --------------------------------------------------------