Fix a bad field name in the comment

    // (if any).

    uint16_t headerSize;

    // Total size of this chunk (in bytes).  This is the chunkSize plus

    // Total size of this chunk (in bytes).  This is the headerSize plus

    // the size of any data associated with the chunk.  Adding this value

    // to the chunk allows you to completely skip its contents (including

    // any child chunks).  If this value is the same as chunkSize, there is

    // any child chunks).  If this value is the same as headerSize, there is

    // no data associated with the chunk.

    uint32_t size;

};