Use lighter wording to discourage fall-through cases

Author: amadio

talk/basicconcepts/control.tex

@@ -91,7 +91,7 @@
   \end{block}
   \pause
   \begin{alertblock}{Use break}
-    Do not try to make use of non breaking cases
+    Avoid \mintinline{cpp}{switch} statements with fall-through cases
   \end{alertblock}
 \end{frame}