The ornamental design for a doll, as shown and described.
FIG. 1 is a front perspective of the right side of a first embodiment of a doll of the invention.
FIG. 2 is a front perspective of the left side of the doll of FIG. 1.
FIG. 3 is a front elevation view of the doll of FIG. 1.
FIG. 4 is a right side elevation view of the doll of FIG. 1.
FIG. 5 is a left side elevation view of the doll of FIG. 1.
FIG. 6 is a rear perspective of the left side of the doll of FIG. 1; and,
FIG. 7 is a rear perspective of the right side of the doll of FIG. 1.
Any elements shown in broken lines form no part of the claimed invention in this application. The broken lines are only shown for environmental purpose only and form no part of the claimed design. The broken lines adjacent to the shaded or sectional portions form an unclaimed boundary of the design.