[AS2] minor typographical errors

Here are some (trivial) typographical errors (features :-)) of AS2-07,
noticed during a recent reading:

1. The string "AS 2" is often used where "AS2" would be more consistent.

2. Bottom of page 4 "For MDNS, ..." should read "For MDNs, ..."

3. Page 5, para 2: "referred to as "generalized receipts."
   (there is a missing close quote).

4. Page 7, para 2: "The term "Receipts" is here used".  "Receipts"
   should not be capitalised.

5. Page 19, para 3: What is a "P.A.I.N. requirement"?  I think this
   needs some kind of reference or at least an expansion of the
   acronym.

6. Example C.1 uses the rsa-md5 signature algorithm.  This is correct,
   but according to AS1 SHA1 is RECOMMENDED (though AS2 seems silent on
   this point).  Also the value "rsa-md5" appears to be historical and
   should be just "md5" anyway (from AS1 page 14).

Deep joy,

Chris.

--
Chris Davenport              [email protected]
Davros Computer Systems