Update wording in Pointers vs References slide

Make bullet points of pointers and references more easily comparable
with each other.

Author: amadio

talk/basicconcepts/references.tex

@@ -30,23 +30,22 @@
   \begin{block}{Specificities of reference}
     \begin{itemize}
     \item Natural syntax
-    \item Must be assigned when defined, cannot be \mintinline{cpp}{nullptr}
-    \item Cannot be reassigned
-    \item Non-const references to temporary objects are not allowed
+    \item Cannot be \mintinline{cpp}{nullptr}
+    \item Must be assigned when defined, cannot be reassigned
+    \item References to temporary objects must be \mintinline{cpp}{const}
     \end{itemize}
   \end{block}
   \begin{block}{Advantages of pointers}
     \begin{itemize}
-    \item Can be reassigned to point elsewhere or to \mintinline{cpp}{nullptr}
-    \item Clearly indicates that argument may be modified
+    \item Can be \mintinline{cpp}{nullptr}
+    \item Can be initialized after declaration, can be reassigned
     \end{itemize}
   \end{block}
   \pause
   \begin{goodpractice}{References}
     \begin{itemize}
-      \item Always use references when you can
-      \item Consider that a referenced object can be modified
-      \item Use \mintinline{cpp}{const} when it's not the case
+      \item Prefer using references instead of pointers
+      \item Mark references \mintinline{cpp}{const} to prevent modification
     \end{itemize}
   \end{goodpractice}
 \end{frame}