webp-container-spec.txt: move ChunkHeader to terminology
this avoids presenting it in the description of a chunk where it could
appear it was defining an element of the diagram
@@ -92,6 +92,12 @@ _1-based_
: An unsigned integer field storing values offset by `-1`. e.g., Such a field
would store value _25_ as _24_.
+_ChunkHeader('ABCD')_
+
+: This is used to describe the _FourCC_ and _Chunk Size_ header of individual
+ chunks, where 'ABCD' is the FourCC for the chunk. This element's size is 8
+ bytes.
+
RIFF File Format
----------------
@@ -125,12 +131,6 @@ Chunk Payload: _Chunk Size_ bytes
: The data payload. If _Chunk Size_ is odd, a single padding byte -- that
SHOULD be `0` -- is added.
-_ChunkHeader('ABCD')_
-
-: This is used to describe the _FourCC_ and _Chunk Size_ header of individual
- chunks, where 'ABCD' is the FourCC for the chunk. This element's
- size is 8 bytes.
-
**Note:** RIFF has a convention that all-uppercase chunk FourCCs are standard
chunks that apply to any RIFF file format, while FourCCs specific to a file
format are all lowercase. WebP does not follow this convention.
