Add missing docs

[ptflores1]

Prerequisites

• I am using the latest version of Locust
• I am suggesting a new feature, not asking a question

Description

I've been reading the documentation and noticed that the taskset.rst file is not included in the docs. In particular it seems that no reference to MarkovTaskSets is reachable in the documentation page.

Can we add these files to docs page?

[cyberw]

TaskSets is intentionally not shown at the top level in the docs because it is so confusing to new users and only rarely useful.

It is mentioned here however: https://docs.locust.io/en/stable/writing-a-locustfile.html#tasksets I could add a reference to MarkovTaskSets here too?