doc: multiple improvements in Stream docs

Add missing links, remove duplicate ones, fix constants and functions styling.
Minor lexical corrections.

PR-URL: #5009
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: estliberitas