Clean and document code

CURA-12361

Author: wawanbreton

include/bridge.h

@@ -43,6 +43,16 @@ std::optional<AngleDegrees> bridgeAngle(
     const SupportLayer* support_layer,
     Shape& supported_regions);
 
+/*!
+ * @brief Make sure the bridging above infill (below skin) is properly printable by expanding the area below the skin so that the bridging would always provide anchoring points
+ *        from the infill lines below
+ * @param infill_contour The complete outer contour of the infill
+ * @param infill_below_skin_area The infill area that should be printed as bridging
+ * @param mesh The mesh being printed
+ * @param completed_layer_plan_below The plan of the layer just below that has been completed by now
+ * @param layer_nr The current layer number
+ * @return A new shape containing the expanded infill below skin area, and the angle to be used to generate bridging in this area
+ */
 std::tuple<Shape, AngleDegrees> makeBridgeOverInfillPrintable(
     const Shape& infill_contour,
     const Shape& infill_below_skin_area,