[basic.stc.dynamic.general] Fix index entries for de/allocation function

Make the entries for 'allocation function' and
'deallocation function' singular.

Author: jensmaurer

source/basic.tex

@@ -3810,10 +3810,13 @@
 \grammarterm{new-expression}{s}\iref{expr.new}, and destroyed using
 \indextext{\idxcode{delete}}%
 \grammarterm{delete-expression}{s}\iref{expr.delete}. A \Cpp{} implementation
-provides access to, and management of, dynamic storage via the global
-\defn{allocation functions} \tcode{\keyword{operator} \keyword{new}} and \tcode{\keyword{operator}
-\keyword{new}[]} and the global \defn{deallocation functions} \tcode{\keyword{operator}
-\keyword{delete}} and \tcode{\keyword{operator} \keyword{delete}[]}.
+provides access to, and management of, dynamic storage via
+the global \defnx{allocation functions}{allocation function}
+\tcode{\keyword{operator} \keyword{new}} and
+\tcode{\keyword{operator} \keyword{new}[]} and
+the global \defnx{deallocation functions}{deallocation function}
+\tcode{\keyword{operator} \keyword{delete}} and
+\tcode{\keyword{operator} \keyword{delete}[]}.
 \begin{note}
 The non-allocating forms described in \ref{new.delete.placement}
 do not perform allocation or deallocation.