labs/kernel-beagleplay-serial-iomem: fix path

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

labs/kernel-beagleplay-serial-iomem/kernel-beagleplay-serial-iomem.tex

@@ -40,7 +40,7 @@ \section{Add UART devices}
 The pinmuxing configuration is already done for UART5. For UART6, you'll have to add
 a pinmuxing section using the information you found in the datasheet. You'll also have to disable the \code{main_spi2} by setting its \code{status} property to \code{"disabled"} in your custom device tree.
 
-{\scriptsize \sourcecode{labs/kernel-beagle-serial-iomem/uarts-pinctrl.dts}}
+{\scriptsize \sourcecode{labs/kernel-beagleplay-serial-iomem/uarts-pinctrl.dts}}
 
 Using a new USB-serial cable with male connectors, provided by your
 instructor, connect your PC to UART5. The wire colors are the same