slides/yocto-recipe-extra: update example, add details

Signed-off-by: Michael Opdenacker <[email protected]>

slides/yocto-recipe-extra/yocto-recipe-extra.tex

@@ -300,17 +300,18 @@ \subsection{Conditional features}
     \item \code{bb.utils.contains(variable, checkval, trueval,
       falseval, d)}: if \code{checkval} is found in
       \code{variable}, \code{trueval} is returned; otherwise
-      \code{falseval} is used.
+      \code{falseval} is used. \code{d} is the BitBake datastore.
     \item \code{bb.utils.filter(variable, checkvalues, d)}: returns
       all the words in the variable that are present in the
       checkvalues.
-    \item Example:
+    \item Example (\code{meta/recipes-connectivity/connman/connman.inc}):
       \begin{block}{}
-      \fontsize{9}{9}\selectfont
+      \fontsize{7.7}{7.7}\selectfont
       \begin{minted}{sh}
 PACKAGECONFIG ??= "wispr iptables client\
-                   ${@bb.utils.filter('DISTRO_FEATURES', '3g systemd wifi', d)} \
+                   ${@bb.utils.filter('DISTRO_FEATURES', '3g systemd', d)} \
                    ${@bb.utils.contains('DISTRO_FEATURES', 'bluetooth', 'bluez', '', d)} \
+                   ${@bb.utils.contains('DISTRO_FEATURES', 'wifi', 'wifi ${WIRELESS_DAEMON}', '', d)} \
 "
       \end{minted}
       \end{block}