Nokia RX-51: Update documentation about ext2/3/4

Since commit 25c5b6517854 ("Nokia RX-51: Do not try calling both ext2load
and ext4load") command ext4load is used for all ext2/3/4 fs variants.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
1 file changed