labs/yocto-extend-recipe: use more specific URL

For documentation about extending recipes through "bbappend".

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

labs/yocto-extend-recipe/yocto-extend-recipe.tex

@@ -19,7 +19,7 @@ \section{Create a basic appended recipe}
 
 Try to create an appended recipe with the help of the online Yocto
 Project development documentation. You can find it at
-\url{https://docs.yoctoproject.org/dev-manual/index.html}. We here
+\url{https://docs.yoctoproject.org/dev-manual/layers.html}. We here
 aim to extend the \ifdefstring{\labboard}{stm32mp1}{\code{linux-stm32mp}}
 {\code{linux-ti-staging}} kernel recipe.