documentation

Pull request #1161: feature/DEV-2374-6.4-D: Added info on JavaScript for widgets.

Merge in WEB/documentation from feature/DEV-2374-6.4-D to release/6.4

* commit '04670e800feca5e1dc7c446b46543c4852bd4769':
  [DEV-2374] Updated image and formatting
  [DEV-2374] Added info on JavaScript for widgets; also updated wording and formatting on updated pages