The ornamental design for a unitdosearticle, as shown and described.
FIG. 1 is a front perspective view of an embodiment of a unit dose article embodying our new design;
FIG. 2 is a front view of the unit dose article;
FIG. 3 is a left view of the unit dose article;
FIG. 4 is a back view of the unit dose article;
FIG. 5 is a right view of the unit dose article;
FIG. 6 is a top view of the unit dose article; and,
FIG. 7 is a bottom view of the unit dose article.
Any broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. Certain features currently not in broken lines may be placed into broken lines in other embodiments while other features in broken lines may be placed in solid lines in other embodiments.