The documentation for AsyncFlowControl says what it is.

But:

• What problem does it solve?
• When should I use it?
• When should I not use it?
• What are the common traps with using it?

Any relationship with ExecutionContext.SuppressFlow() is not clear unless a person already knows the answer to this question, hence I don't consider the question about ExecutionContext.SuppressFlow() to be a helpful duplicate.