clarify how map shows data points grouped or not based on checkbox

[baeolophus]

user, workshop2: "I think having the points group together when you're zoomed out too far is kind of confusing? I think keeping them separated would quell any anxiety about whether the individual reader points uploaded correctly (as separate locations with their own individual latitudes and longitudes). "

[baeolophus]

another user workshop2: "I didn't like the reader location being lumped at certain zoomed out resolutions."

[baeolophus]

another user workshop2: "I didn't much like how the labels formed a spiral on some people's screens, and I think just forming a single reader label makes more sense. "