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.
Updates code snippits in tutorial.
Edited SequentialPlayCount: standardized formatting, spelling, no major changes.

Signed-off-by: Lee Sheng <lsheng@wibidata.com>
Add explanation of code drop downs to music tutorial overview.

Signed-off-by: Juliet Hougland <juliet@wibidata.com>
Remove extra $ from a command
Fixed landing page link to javadocs.