fixup missed edit

Author: jensmaurer

source/basic.tex

@@ -6329,7 +6329,7 @@
 sequentially consistent atomic operations\iref{atomics.order}, or
 \item there are evaluations $B$ and $C$
 such that $A$ is sequenced before $B$,
-$B$ simply happens before $C$, and
+$B$ happens before $C$, and
 $C$ is sequenced before $D$, or
 \item there is an evaluation $B$ such that
 $A$ strongly happens before $B$, and