Fix misstatement in Section 5 Conformance, line 648

Noted likely misstatement in Section 5.2 "Conformance as an EDXL-HAVE Message":

in paragraph (c), [line 648] the text reads:
[An XML 1.0 element is a conforming EDXL-HAVE-v2.0 Message if and only if:]

c) if its namespace name is "urn:oasis:names:tc:emergency:edxl:have:2.0", then its content [...]

I'm pretty sure this SHOULD be:

c) if its namespace name is "urn:oasis:names:tc:emergency:edxl:have:2.0", AND its content [...]