The ornamental design for a doorassembly, as shown and described.
FIG. 1 is a front isometric view of a door assembly in accordance with an embodiment of the invention;
FIG. 2 is a front elevational view of the door assembly of FIG. 1;
FIG. 3 is a back elevational view of the door assembly of FIG. 1;
FIG. 4 is a top plan view of the door assembly of FIG. 1;
FIG. 5 is a bottom plan view of the door assembly of FIG. 1; and,
FIG. 6 is a right side elevational view of the door assembly of FIG. 1, the left side elevational view (not shown) being a mirror image of the right side elevational view.