CURA-4525 add comment and type hint

cura/Arranging/Arrange.py

@@ -169,6 +169,7 @@ class Arrange:
     #   \param x x-coordinate
     #   \param y y-coordinate
     #   \param shape_arr ShapeArray object
+    #   \param update_empty updates the _is_empty, used when adding disallowed areas
     def place(self, x, y, shape_arr, update_empty = True):
         x = int(self._scale * x)
         y = int(self._scale * y)

cura/Arranging/ArrangeObjectsAllBuildPlatesJob.py

@@ -18,7 +18,7 @@ from typing import List
 
 
 class ArrangeArray:
-    def __init__(self, x, y, fixed_nodes):
+    def __init__(self, x: int, y: int, fixed_nodes: List[SceneNode]):
         self._x = x
         self._y = y
         self._fixed_nodes = fixed_nodes