The ornamental design for an awning for the side of a vehicle, as shown and described.
FIG. 1. is a perspective view of an awning for the side of a vehicle according to the present invention.
FIG. 2 is a perspective view of the awning for the side of a vehicle shown in the context of a vehicle according to the present invention.
FIG. 3 is a perspective view of the detachable tunnel forming a part of the awning for the side of a vehicle according to the present invention.
FIG. 4 is a perspective view of the awning for the side of a vehicle with the tunnel detached and the flap closed shown according to the present invention; and,
FIG. 5 is a perspective view of the awning for the side of a vehicle with the tunnel detached and the open according to the present invention.
The broken lines in the drawings show environmental structure that form no part of the design to be patented.