docs: Remove counterclockwise order requirement for PolygonComponent …

…vertices (#3352)

The documentation used to require that lists of vertices in
PolygonComponent (and its subclass PolygonHitbox) should be in
counterclockwise order. This is no more necessary because the
implementation is robust:
https://github.com/flame-engine/flame/blob/main/packages/flame/lib/src/geometry/polygon_component.dart#L122-L124

Moreover, the wording was a bit confusing (the example looks clockwise).

The paragraphs mentioning the vertex order were deleted altogether.

doc/flame/collision_detection.md

@@ -264,8 +264,6 @@ them so don't doubt to use them even if your use case isn't listed here.
 It should be noted that if you want to use collision detection or `containsPoint` on the `Polygon`,
 the polygon needs to be convex. So always use convex polygons or you will most likely run into
 problems if you don't really know what you are doing.
-It should also be noted that you should always define the vertices in your polygon
-in a counter-clockwise order.
 
 The other hitbox shapes don't have any mandatory constructor, that is because they can have a
 default calculated from the size of the collidable that they are attached to, but since a

doc/flame/components.md

@@ -1070,9 +1070,9 @@ For example you could create a diamond shapes polygon like this:
 void main() {
   PolygonComponent.relative(
     [
-      Vector2(0.0, 1.0), // Middle of top wall
+      Vector2(0.0, -1.0), // Middle of top wall
       Vector2(1.0, 0.0), // Middle of right wall
-      Vector2(0.0, -1.0), // Middle of bottom wall
+      Vector2(0.0, 1.0), // Middle of bottom wall
       Vector2(-1.0, 0.0), // Middle of left wall
     ],
     size: Vector2.all(100),
@@ -1090,9 +1090,6 @@ the center of the polygon.
 In the image you can see how the polygon shape formed by the purple arrows is defined by the red
 arrows.
 
-Remember to define the lists in a counter clockwise manner (if you think in the screen coordinate
-system where the y-axis is flipped, otherwise it is clockwise).
-
 
 ### RectangleComponent