docs: driver-api: firmware: fallback-mechanisms: Fix rendering of bullet point

Without this patch, the "Firmware is not accessible [...]" line is
rendered in bold, which does not seem intentional.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20200905184131.1280337-1-j.neuschaefer@gmx.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>