The ornamental design for ladder stile section, as shown and described.
FIG. 1 is a perspective view of ladder stile section showing an embodiment of our new design;
FIG. 2 is a side view of one of the ladder stile section shown in FIG. 1, wherein a side view of the other corresponding rail shown in FIG. 1 is a mirror image of that which is shown in FIG. 2; and,
FIG. 3 is an enlarged view of a portion of ladder stile section shown FIG. 2.
The uneven broken line representations in the drawings are for illustrative purposes only and form no part of the claimed design.