Removed dot3 references

I've removed dot3 from FilterPy, so it needed to be removed from the book.

10-Unscented-Kalman-Filter.ipynb

@@ -2382,7 +2382,7 @@
     "    K = dot(Pxz, inv(Pz)) # Kalman gain\n",
     "\n",
     "    self.x = self.xp + dot(K, z-zp)\n",
-    "    self.P = self.Pp - dot3(K, Pz, K.T)\n",
+    "    self.P = self.Pp - dot(K, Pz).dot(K.T)\n",
     "```"
    ]
   },

Appendix-E-Ensemble-Kalman-Filters.ipynb

@@ -521,7 +521,7 @@
     "\n",
     "```python\n",
     "    x = np.mean(sigmas, axis=0)\n",
-    "    P = self.P - dot3(K, P_zz, K.T)\n",
+    "    P = self.P - dot(K, P_zz).dot(K.T)\n",
     "```"
    ]
   },