Lab 0: Links to the Raspberry Pi documentation are outdated

[abt8601]

In the "Flash Bootable Image to SD Card" section, the two Raspberry Pi official documentation links (https://www.raspberrypi.org/documentation/configuration/boot_folder.md and https://www.raspberrypi.org/documentation/hardware/raspberrypi/bootmodes/README.md) are outdated and redirect to somewhere else. I believe the current links for these topics are https://www.raspberrypi.com/documentation/computers/configuration.html#the-boot-folder and https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#raspberry-pi-boot-modes, respectively.