ROIS2 — Conflict descriptions in "person detection."

The description of "person detection" component says "Detects number of people", but Figure 8.14 shows the flow that firstly returns if there are people.
There is a conflict between them.

Description of "person detection" modified to avoid inconsistency.

The first sentence of the description is modified by deleting "number of". As shown in Figure 8.14, the component does not detect "the number of persons" but "existence of persons" as its primary functionality, even though it reports the number of detected persons in event messages.