coreboot_tables: Document coreboot framebuffer

A discussion around the `bytes_per_line` field (it was ignored in
CorebootPayloadPkg for some reason) made the lack of documentation
obvious.

Change-Id: I5e1343b5fe37ac106e61e6907fbcc1737ac56f8b
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/23466
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

0 files changed, 0 insertions, 0 deletions