[class.conv.ctor] Turn last paragraph into a note

[Eisenwave]

Paragraph 1 already states:

draft/source/classes.tex

Lines 2347 to 2353 in 1c22d62

	\pnum
	A constructor that is not explicit\iref{dcl.fct.spec}
	specifies a conversion from
	the types of its parameters (if any)
	to the type of its class.
	Such a constructor is called a
	\defnadj{converting}{constructor}.

The reader has no reason to believe that a copy/move constructor is excluded from the rule, and it certainly doesn't need to be stated in normative wording. The whole paragraph can and should be a note.

[jensmaurer]

CWG 2023-11-11: Approved as-is.

[tkoeppe]

@jensmaurer Would you prefer to take it as is, or wait for the improvements Davis has suggested?

[tkoeppe]

@jensmaurer Ping

[jensmaurer]

We can go forward as-is, and address Davis' concerns at a later stage. The important part is that CWG approved changing normative text to a note; fixing the note is then purely editorial.