argument expressions to ranges::swap reference, rather than denote, o…

…bjects

Fixes #306.

utilities.tex

@@ -109,7 +109,7 @@
 \end{codeblock}
   and does not include a declaration of \tcode{ranges::swap}.
   If the function selected by overload resolution does not
-  exchange the values denoted by \tcode{E1} and \tcode{E2},
+  exchange the values referenced by \tcode{E1} and \tcode{E2},
   the program is ill-formed with no diagnostic required.
 
 \item
@@ -124,7 +124,7 @@
   Otherwise, if \tcode{E1} and \tcode{E2} are lvalues of the
   same type \tcode{T} which meets the syntactic requirements of
   \tcode{MoveConstructible<T>()} and
-  \tcode{Assignable<T\&, T>()}, exchanges the denoted values.
+  \tcode{Assignable<T\&, T>()}, exchanges the referenced values.
   \tcode{ranges::swap(E1, E2)} is a constant expression if
   the constructor selected by overload resolution for
   \tcode{T\{std::move(E1)\}} is a constexpr constructor and
@@ -142,7 +142,7 @@
 
 \pnum
 \remark Whenever \tcode{ranges::swap(E1, E2)} is a valid
-expression, it exchanges the values denoted by \tcode{E1}
+expression, it exchanges the values referenced by \tcode{E1}
 and \tcode{E2} and has type \tcode{void}.
 
 \rSec2[utility.exchange]{\tcode{exchange}}