slides/yocto-recipe-extra: add details

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

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

@@ -109,7 +109,7 @@ \subsection{Using Python code in metadata}
   \frametitle{Python code examples}
   \small
   \begin{minted}{python}
-# Anonymous function
+# Anonymous function (automatically called at parsing time)
 python __anonymous() {
     if d.getVar("FOO", True) == "example":
         d.setVar("BAR", "Hello, World.")
@@ -121,7 +121,7 @@ \subsection{Using Python code in metadata}
 }
   \end{minted}
   \begin{minted}{sh}
-# Inline
+# Inline Python code
 do_install() {
     echo "Build OS: ${@os.uname()[0].lower()}"
 }
@@ -150,10 +150,11 @@ \subsection{Variable flags}
 \end{frame}
 
 \begin{frame}[fragile]
-  \frametitle{Examples}
+  \frametitle{Variable flags examples}
   \begin{itemize}
     \item \code{dirs}: directories that should be created before the task
       runs. The last one becomes the work directory for the task.
+      Example: \code{do_fetch} in \code{base.bbclass}.
       \begin{minted}{sh}
 do_compile[dirs] = "${B}"
       \end{minted}