One small text tweak

Author: hollasch

books/RayTracingTheRestOfYourLife.html

@@ -622,7 +622,7 @@
   $$ Color = \int A \cdot s(direction) \cdot \text{color}(direction) $$
 </div>
 
-Note that $A$ and $s()$ may depend on the view direction and the scattering position (position on a
+Note that $A$ and $s()$ may depend on the view direction or the scattering position (position on a
 surface or position within a volume). Therefore, the output color may also vary with view direction
 or scattering position.