Add details on the handling of the day time step in the fluid chart in consumption.md

docs/ecolyo/functionalities/consumption.md

@@ -66,6 +66,10 @@ This component allows the user to navigate through the different fluids.
 
 This component displays consumption, according to the selected fluid, timestep and date.
 
+It uses two children components for the Day timestep (electricity only) in case no half-hour data is received : 
+- The HalfHourUpcoming component is displayed if the konnector has been updated within the last 3 days indicating data is potentially coming later.
+- The HalfHourNoDataFailure component is displayed if the konnector has not been updated within the last 3 days, suggesting a more permanent issue in data retrieval.
+
 #### FluidChartSwipe
 
 This component calls the `FluidChartSlide` component which is handled by the library `react-swipeable-views`, and allows the user to swipe across the data.