2lib: Fix minor comments in 2api.c

This CL is a minor fix of comments from CL:3168437.

Since we have more and more steps below vb2_check_recovery in 2api:
vb2api_fw_phase1, remove the text 'two' in the comments.

BUG=none
BRANCH=none
TEST=none

Signed-off-by: Hsuan Ting Chen <roccochen@chromium.org>
Change-Id: I2e13281adc127166954fde34a40f3a8b1d5d42ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3359103
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
1 file changed