[class.copy.ctor] Remove reference to non-existing example

Fixes ISO/CS comment (C++23 proof)

Author: jensmaurer

source/classes.tex

@@ -1594,7 +1594,7 @@
 \tcode{X}
 performs a memberwise copy/move of its bases and members.
 \begin{note}
-Default member initializers of non-static data members are ignored. See also the example in~\ref{class.base.init}.
+Default member initializers of non-static data members are ignored.
 \end{note}
 The order of initialization is the same as the order of initialization of bases
 and members in a user-defined constructor (see~\ref{class.base.init}).