Fixed documentation of circle

A circle is not a rectangle.

pycardium/modules/py/display.py

@@ -176,7 +176,7 @@ class Display:
         :param y: center y coordinate
         :param rad: radius
         :param col: color of the outline and fill (expects RGB triple)
-        :param filled: whether the rectangle should be filled or not
+        :param filled: whether the circle should be filled or not
         :param size: size of the individual pixels, ranges from 1 to 8
         """