kernel: dt: Fix style

Signed-off-by: Miquel Raynal <[email protected]>

slides/kernel-hw-devices/kernel-hw-devices.tex

@@ -710,7 +710,7 @@ \subsection{Describing non-discoverable hardware}
     \item Their meaning is usually described in one place: the core DT
       schema available at \url{https://github.com/devicetree-org/dt-schema}.
     \item \code{compatible}, \code{reg},
-      \usebeamercolor[fg]{code}\path{#address-cells}, etc
+      {\usebeamercolor[fg]{code}\path{#address-cells}}, etc
     \end{itemize}
   \item Subsystem specific and cover generic consumer bindings
     \begin{itemize}