Use the new boot_firmwares labels that help make documentation more
specific as to which firmwares are used in which devices
Signed-off-by: Dhruva Gole <d-gole@ti.com>
Title underlines should match the length of the title. Unfortunately
docutils only catches underlines that are too short.
Add some missing empty lines after titles.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
