update notebook

Author: AtsushiSakai

PathTracking/model_predictive_speed_and_steer_control/notebook.ipynb

@@ -4,7 +4,13 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Model predictive speed and steering control"
+    "# Model predictive speed and steering control\n",
+    "\n",
+    "https://github.com/AtsushiSakai/PythonRobotics/blob/master/PathTracking/model_predictive_speed_and_steer_control/model_predictive_speed_and_steer_control.py\n",
+    "\n",
+    "This is a path tracking simulation using model predictive control (MPC)\n",
+    "\n",
+    "The MPC controller controls vehicle speed and steering base on linealized model"
    ]
   },
   {
@@ -206,7 +212,8 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "This equation is implemented at https://github.com/AtsushiSakai/PythonRobotics/blob/eb6d1cbe6fc90c7be9210bf153b3a04f177cc138/PathTracking/model_predictive_speed_and_steer_control/model_predictive_speed_and_steer_control.py#L80-L102"
+    "This equation is implemented at \n",
+    "https://github.com/AtsushiSakai/PythonRobotics/blob/eb6d1cbe6fc90c7be9210bf153b3a04f177cc138/PathTracking/model_predictive_speed_and_steer_control/model_predictive_speed_and_steer_control.py#L80-L102"
    ]
   },
   {