p3-payload proofreading

1) This read a bit awkward. I'm not sure if my suggestion retains the
original meaning.

OLD
There may exist multiple representations associated with a particular
response status.

NEW
It is possible for multiple representations to be associated with a
particular response status.

2) I think this means "*" for subtype, for example "text/*" and not
literally "type/*". (While we literally mean "*/*").  Maybe because
this comes directly after the ABNF it is fine?

The asterisk "*" character is used to group media types into ranges,
with "*/*" indicating all media types and "type/*" indicating all
subtypes of that type.

3) Capitalize W?

OLD
Note: while the definition of Content-MD5

NEW
Note: While the definition of Content-MD5


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(( Anthony Bryan ... Metalink [ http://www.metalinker.org ]
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