[atomics.types.operations] Fix typo in exposition-only code

Fixes NB JP 010 (C++20 DIS)

Author: JohelEGP

source/atomics.tex

@@ -1907,7 +1907,7 @@
 if (memcmp(this, &expected, sizeof(*this)) == 0)
   memcpy(this, &desired, sizeof(*this));
 else
-  memcpy(expected, this, sizeof(*this));
+  memcpy(&expected, this, sizeof(*this));
 \end{codeblock}
 \end{note}
 \begin{example}