Changed the order of arguments for the Arc gizmo docs (#12854)

Just updating docs for the arc gizmo so that the argument documentation
matches the order of the function arguments.
Also added docs for the color argument.

# Objective

- Improve docs

## Solution

- Moved the radius argument to the end of the argument list to match the
function

---

## Changelog

> N/A

## Migration Guide

> N/A

---------

Co-authored-by: François Mockers <francois.mockers@vleue.com>

crates/bevy_gizmos/src/arcs.rs

@@ -18,10 +18,11 @@ impl<'w, 's, T: GizmoConfigGroup> Gizmos<'w, 's, T> {
     ///
     /// # Arguments
     /// - `position` sets the center of this circle.
-    /// - `radius` controls the distance from `position` to this arc, and thus its curvature.
     /// - `direction_angle` sets the clockwise  angle in radians between `Vec2::Y` and
     /// the vector from `position` to the midpoint of the arc.
     /// - `arc_angle` sets the length of this arc, in radians.
+    /// - `radius` controls the distance from `position` to this arc, and thus its curvature.
+    /// - `color` sets the color to draw the arc.
     ///
     /// # Example
     /// ```