[intro.races] Make reading atomic object nondeterministic

source/basic.tex

@@ -6269,7 +6269,7 @@
 \pnum
 The value of an
 atomic object $M$, as determined by evaluation $B$, shall be the value
-stored by some
+stored by some unspecified
 side effect $A$ that modifies $M$, where $B$ does not happen
 before $A$.
 \begin{note}