Adding hosting changes faq to main docs.

Note that this is a recreation of Issue 181463005 as my master branch
was broken.

BUG=345944

NOTRY=true

Review URL: https://codereview.chromium.org/186803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254782 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 254782