Set co-leads to confirmed automatically, and updated test and documents.

handle_volunteers.go

@@ -109,6 +109,10 @@ func (app *App) handleUpdateVolunteer(w http.ResponseWriter, r *http.Request) {
 		writeError(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
+
+	if v.IsLead {
+		app.confirmVolunteer(id)
+	}
 	updated, _ := app.getVolunteer(id)
 	writeJSON(w, updated)
 }