[Docs] Make the security note readable.
[Docs] Make the security note readable.

This was really unreadable for me. I hope it's clearer now.

Change-Id: I45d86673ba32dc97dba4b5c5e3c2c576ef1d04ad
(cherry picked from commit 85591a0f79f4fcd83252f68ed2351a56e335787f)

yanyao/newton,yanyao/newton