[Polygon / Path] clarify docs

fatamorgana/records.py

@@ -1717,8 +1717,8 @@ class Polygon(Record, GeometryMixin):
     repetition: repetition_t | None
     point_list: point_list_t | None
     """
-    List of offsets from the initial vertex (x, y) to the remaining
-    vertices, `[[dx0, dy0], [dx1, dy1], ...]`.
+    List of offsets between consecutive vertices, starting from the initial
+    vertex (x, y): `[[dx0, dy0], [dx1, dy1], ...]`.
     The list is an implicitly closed path, vertices are [int, int].
     The initial vertex is located at (x, y) and is not represented in `point_list`.
     `None` means reuse modal.
@@ -1744,7 +1744,7 @@ class Polygon(Record, GeometryMixin):
         self.point_list = point_list
         self.properties = [] if properties is None else properties
 
-        if point_list is not None and len(point_list) < 3:
+        if point_list is not None and len(point_list) < 2:
             warn('Polygon with < 3 points', stacklevel=2)
 
     def get_point_list(self) -> point_list_t:
@@ -1827,8 +1827,8 @@ class Path(Record, GeometryMixin):
     repetition: repetition_t | None = None
     point_list: point_list_t | None = None
     """
-    List of offsets from the initial vertex (x, y) to the remaining vertices,
-    `[[dx0, dy0], [dx1, dy1], ...]`.
+    List of offsets between consecutive vertices, starting from the initial
+    vertex (x, y): `[[dx0, dy0], [dx1, dy1], ...]`.
     The initial vertex is located at (x, y) and is not represented in `point_list`.
     Offsets are [int, int]; `None` means reuse modal.
     """