fix toc and minor python code

Author: StefanRR

data_management_learning_path/_toc.yml

@@ -33,8 +33,6 @@ parts:
     - file: exd_api/overview
       title: Overview
     - file: exd_api/test_exd_service
-    - url: https://github.com/peak-solution?view_as=public#connect-your-data
-      title: Existing EXD-API Plugins (external)
     - url: https://github.com/peak-solution/asam_ods_exd_api_mdf4/blob/main/README.md
       title: ASAM ODS EXD-API MDF4 plugin (external) 
   - caption: Work with Apache Spark

data_management_learning_path/ods/kaggl_electric_motor_temperature_example.ipynb

@@ -564,7 +564,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": null,
    "metadata": {},
    "outputs": [
     {
@@ -590,10 +590,10 @@
    ],
    "source": [
     "fig, ax = plt.subplots()\n",
-    "ax.plot(dm_df['Motor_speed'], dm_df['Torque'])\n",
-    "ax.set_title(profile_name)\n",
-    "ax.set_ylabel('Torque in Nm')\n",
-    "ax.set_xlabel('Motor speed in rpm')"
+    "_ = ax.plot(dm_df['Motor_speed'], dm_df['Torque'])\n",
+    "_ = ax.set_title(profile_name)\n",
+    "_ = ax.set_ylabel('Torque in Nm')\n",
+    "_ = ax.set_xlabel('Motor speed in rpm')"
    ]
   },
   {