Docs: Fixes to Preview "Program Overview" page; rewording on "Support" page

Fixes broken anchors in yellow banner on English version. Adds the banner
to non-English version pages. Adjusted wording for a Known Issue on the
"Support and Release Notes" page.

Change-Id: Ia1db8db34cec854bcc4ad7daa1ad44fa23fc878e
9 files changed