"about" and "of" are frequently interchangeable when they introduce the subject-matter. However, "of" is preferred when what follows is the object of the action denoted by the noun that precedes it, for example:
- an account of the events (the events are narrated) - a description of the accident (the accident is described) - an explanation of the theory (the theory is explained)
I'm not sure why you want to use "scenario" (which, if used, should take an article). I'd use this sentence to convey what I think you want to express:
(3) The introduction contains a clear description of the topic.
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