Update Errata.md

Author: chalonverse

Errata.md

@@ -24,6 +24,8 @@ please create an issue on this GitHub repository.
   - Page 386: The virtual position of sound equation yields a vector rather than a position (The virtual position
     of the sound is obtained by adding the camera position to that vector). This equation is required for Ex 7.2
     (found by Joshua Hardman)
+* Chapter 10
+  - The PhysWorld::SegmentCast function is missing code to update closestT, which is fixed in the source in this repo.
 * Chapter 13
   - Page 396: In the equations for bilinear interpolation, the vFactor component should access the .v
     components of P, A, and C, not the .u components (found by Takashi Imagire)