Fix XML docs

Author: JimBobSquarePants

src/PolygonClipper/Contour.cs

@@ -80,7 +80,7 @@ public Vertex this[int index]
     /// Gets the segment at the specified index of the contour.
     /// </summary>
     /// <param name="index">The index of the segment.</param>
-    /// <returns>The <see cref="GetSegment"/>.</returns>
+    /// <returns>The <see cref="Segment"/>.</returns>
     internal Segment GetSegment(int index)
         => (index == this.Count - 1)
         ? new Segment(this.vertices[^1], this.vertices[0])

src/PolygonClipper/SweepEvent.cs

@@ -199,7 +199,7 @@ public bool IsBefore(SweepEvent other)
     /// <summary>
     /// Returns the segment associated with the sweep event.
     /// </summary>
-    /// <returns>The <see cref="GetSegment"/>.</returns>
+    /// <returns>The <see cref="Segment"/>.</returns>
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public Segment GetSegment() => new(this.Point, this.OtherEvent.Point);
 }