cmd: pxe: add alias devicetree-overlay for fdtoverlays

This adds keyword devicetree-overlay as an alias for fdtoverlays in
extlinux (sysboot) and pxe to better follow the Boot Loader Specification
[1], improves documentation around them by adding an example for both
fdtoverlays and devicetree-overlay and the environment variable required
for this feature. The link for the spec is updated to the current one.

[1] https://systemd.io/BOOT_LOADER_SPECIFICATION/

Signed-off-by: Edoardo Tomelleri <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]>
Reviewed-by: Ramon Fried <[email protected]>

0 files changed, 0 insertions, 0 deletions