Better layout

Author: sponce

talk/expert/cpp20concepts.tex

@@ -164,7 +164,10 @@
     \frametitlecpp[20]{Some usages of concepts}
     \begin{block}{Abbreviated function templates}
       \begin{itemize}
-        \item function parameters, similar to variables, can be constrained as well
+        \item function parameters can be constrained as well
+        \begin{itemize}
+          \item similar to variables
+        \end{itemize}
         \item the template head becomes obsolete
         \item the function is still a template though!
         \item unconstrained \mintinline{cpp}{auto} parameters are allowed as well