docs: Fix typos in write protection doc
docs: Fix typos in write protection doc

BRANCH=none
BUG=none
TEST=view in gitiles

Signed-off-by: Tom Hughes <fc5c12f30a5ed2baa0581f44ee14ad1eb7b20d83@chromium.org>
Change-Id: Ib512490365a0f20380813bd871f7effbf374a435
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2552604
Reviewed-by: Jack Rosenthal <d3f605bef1867f59845d4ce6e4f83b8dc9e4e0ae@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec