[func.wrap.ref.class] Change "this subclause" to "subclause [func.wrap.ref]" to account for the external use of "call-args".

Author: burblebee

source/utilities.tex

@@ -13520,7 +13520,7 @@
 that models \libconcept{copyable}.
 
 \pnum
-Within this subclause,
+Within subclause \ref{func.wrap.ref},
 \tcode{\placeholder{call-args}} is an argument pack with elements such that
 \tcode{decltype((\placeholder{call-args}))...} denote
 \tcode{Args\&\&...} respectively.