rephrased a comment

src/main/java/org/orekit/attitudes/CelestialBodyPointed.java

@@ -120,9 +120,9 @@ public class CelestialBodyPointed implements AttitudeLaw {
 
         // evaluate instant rotation axis by finite differences
         // note that despite we use forward difference and not centered differences,
-        // the error in this estimation is O(h^2) for Sun since because Earth-Body
-        // acceleration is in both case colinear to Earth-Body vector, so acceleration
-        // contribution is nullified by the cross product.
+        // the error in this estimation is O(h^2) for Sun since Earth-Sun acceleration
+        // is colinear to Earth-Sun pointing vector, so acceleration contribution is
+        // nullified by the cross product.
         final Vector3D rotAxisCel =
             new Vector3D(1 / (r2 * STEP_SIZE), Vector3D.crossProduct(pointing0, pointing1));