[hash.requirements] clarify that Cpp17Hash does not imply stateless

Author: jwakely

source/lib-intro.tex

@@ -2076,7 +2076,7 @@
   the program.
 \begin{note}
 Thus all evaluations of the expression \tcode{h(k)} with the
-  same value for \tcode{k} yield the same result for a given execution of the program.
+  same values for \tcode{h} and \tcode{k} yield the same result for a given execution of the program.
   \end{note}
   For two different
   values \tcode{t1} and \tcode{t2}, the probability that \tcode{h(t1)} and \tcode{h(t2)}