Fixes links in all versions of userguides.

Signed-off-by: Juliet Hougland <juliet@wibidata.com>
Add accordion links to the code.

Signed-off-by: Juliet Hougland <juliet@wibidata.com>
Adds a number of JavaDoc links.

Signed-off-by: Daisy Zhou <daisy@wibidata.com>
Editing pass over producer page.