FSMCFRFF — In Section 7.2.4.2, detail descriptions for each element of the table of hints are required

In Section 7.2.4.2, each element of the table of hints is hard to understand with out any detail description.

Explanations and examples have been added to the hint argument of ComponentObserver::update_status

To make the usage of hint argument of ComponentObserver::update_status clearer, explanations and examples have been added to each definition of hint in Section 7.2.4.2.