Style the note about the naming of "deflate" (#41)

Make the note about the use of "deflate" to refer to the "zlib" format
more prominent by rendering it as a note.

Also regenerate index.html, which has the side-effect of adding MDN
annotations.

Author: ricea

index.bs

@@ -69,7 +69,8 @@ A <dfn>compression context</dfn> is the internal state maintained by a compressi
 : `deflate`
 :: "ZLIB Compressed Data Format" [[!RFC1950]]
 
-   * This format is referred to as "deflate" for consistency with HTTP Content-Encodings. See [[RFC7230]] section 4.2.2.
+   Note: This format is referred to as "deflate" for consistency with HTTP Content-Encodings. See [[RFC7230]] section 4.2.2.
+
    * Implementations must be "compliant" as described in [[!RFC1950]] section 2.3.
    * Field values described as invalid in [[!RFC1950]] must not be created by CompressionStream, and are errors for DecompressionStream.
    * The only valid value of the `CM` (Compression method) part of the `CMF` field is 8.