Doc/mb/lenovo: Explain simpler GM45 flash method first

Do not mislead newcomers into thinking the GM45 series laptops are hard
to flash. Describe the simple coreboot flashing procedure first, then
explain how to remove the ME firmware and use a custom flash layout.

Also, reword a sentence on the simple flashing procedure for clarity.

Change-Id: Ie83ec3d20f00e9d9c869e483e24d601506857f07
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48604
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Swift Geek (Sebastian Grzywna) <swiftgeek@gmail.com>
Reviewed-by: Evgeny Zinoviev <me@ch1p.io>

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