Adding documentation to ev-to-page-info.md in src/docs/security/
to describe EV certificate UI changes in Chrome 77.

Bug: 992132
Change-Id: I1c614e0d7f66d6719f511740f18a5754561c9a35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1742810
Commit-Queue: Devon O'Brien <asymmetric@chromium.org>
Reviewed-by: Christopher Thompson <cthomp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685377}