Document opening treatment details from the main graph

docs/setup/lf-setup.md

@@ -81,6 +81,9 @@ Once you’ve configured your settings, your Home screen will look as beautiful
 * **Move through time:** drag left or right. If you leave the graph in the past, it returns to the latest data after about 5 minutes, or right away when you tap the jump to now button at the lower right.
 * **Zoom:** pinch to show between 15 minutes and 24 hours, or double tap to step through 1, 3, 6, 12 and 24 hours.
 * **Tap** a glucose reading, treatment, override or temporary target to see its value and time. Tap an empty spot to close it.
+    * Carbs, boluses, overrides and temporary targets that are listed on the [Treatments](lf-features.md#treatments) screen get a label with an arrow. Tap the label to open the treatment's details (*LoopFollow* 7.2 and newer).
+
+    ![label for a carb entry on the main graph](img/lf-graph-treatment-pill.png){width="350"}
 * **Press and hold, then drag** to look back in time. While your finger is down:
     * The glucose display and the Information Display show the values at that time. They are shaded gray and the time is shown with a clock symbol, so they are not mistaken for current values.
     * The forecast the looping app made at that time is drawn on the graph.