yocto: slides: improve readability of picture

Text is quite small, enlarge the picture.

Signed-off-by: Luca Ceresoli <[email protected]>

slides/yocto-advanced/yocto-advanced.tex

@@ -292,11 +292,12 @@ \subsection{Variables}
 \begin{frame}
   \frametitle{Order of variable assignment}
   \begin{columns}
-    \column{0.4\textwidth}
+    \column{0.55\textwidth}
       \includegraphics[width=\textwidth]{slides/yocto-advanced/yocto-operators-order.pdf}
-    \column{0.6\textwidth}
+    \column{0.45\textwidth}
       \begin{enumerate}
-        \item All the operators are applied, in parsing order
+        \item All the operators are applied,\\
+          in parsing order
         \item \code{:append} overrides are applied
         \item \code{:prepend} overrides are applied
         \item \code{:remove} overrides are applied