Fix javadoc issues

src/main/java/org/apache/commons/math4/geometry/euclidean/threed/SphericalCoordinates.java

@@ -66,7 +66,7 @@ public class SphericalCoordinates implements Serializable {
     /** Polar angle (co-latitude) Φ. */
     private final double phi;
 
-    /** Jacobian of (r, θ &Phi). */
+    /** Jacobian of (r, θ Φ). */
     private double[][] jacobian;
 
     /** Hessian of radius. */