Web server tutorial doesn't mention convenience modules

Some guidance on which modules to use was pushed to the documentation but is not yet reflected in the tutorial (web.txt): 
https://github.com/SWI-Prolog/packages-http/pull/135/files

(I can do this; don't know when ... note to self: https://swi-prolog.discourse.group/t/problem-with-saved-state-and-http-server-at-win10/2595/14?u=peter.ludemann)