docs: Documenting fix for CVE-2014-0224 (SSL vulnerability).

Wrote a training page on how to use Google Play services to update a
device's security provider, which (int. al.) installs a fix against
the recently-discovered SSL CCS injection vulnerability.

Doc is staged to:

http://asolovay.mtv:9338/training/articles/security-gms-provider.html

bug: 16296338

Change-Id: I5b0dd052113998d585a46262b216ef0c1b432362