[intro.races] Rephrase questionable phrasing in note

jensmaurer · jensmaurer · commit 6bd269d68be8 · 2025-02-27T00:30:27.000+01:00
diff --git a/source/basic.tex b/source/basic.tex
@@ -6316,7 +6316,7 @@
 \item $A$ happens before $X$ and $X$ happens before $B$.
 \end{itemize}
 \begin{note}
-An evaluation cannot happen before itself.
+An evaluation does not happen before itself.
 \end{note}
 
 \pnum
