update notebooks

Author: TillBeemelmanns

index.ipynb

@@ -28,7 +28,7 @@
     "### Section 1: Introduction and Tools\n",
     "| No.| Topic                                          | Importance| Exercise  | Solution  |\n",
     "|--- |---                                             |---        |---        |---        |\n",
-    "| 1  | Intoduction to Jupyter Notebooks               | Optional  | [Exercise](section_1_introduction_and_tools/1_introduction_to_python_and_jupyter_notebooks.ipynb)  | N/A  |\n",
+    "| 1  | Introduction to Jupyter Notebooks               | Optional  | [Exercise](section_1_introduction_and_tools/1_introduction_to_python_and_jupyter_notebooks.ipynb)  | N/A  |\n",
     "| 2  | Introduction to Python, NumPy and Vectorization| Optional  | [Exercise](section_1_introduction_and_tools/2_introduction_to_numpy.ipynb)  | Available on edX |\n",
     "| 3  | Introduction to ROS1                           | Optional  | [Exercise](section_1_introduction_and_tools/3_introduction_to_ros1.ipynb)  | N/A |\n",
     "| 4  | ROS1 Message Visualization                     | Optional  | [Exercise](section_1_introduction_and_tools/4_message_visualization_ros1.ipynb)  | N/A |\n",

section_1_introduction_and_tools/4_message_visualization_ros1.ipynb

@@ -226,7 +226,7 @@
    "source": [
     "# Stop the master \n",
     "\n",
-    "Now you should go back to the Terminal and stop the master node by clicking ctrl+ C\n",
+    "Now you should go back to the Terminal and stop the master node by pressing ctrl+ C\n",
     "\n",
     "![image.png](attachment:050c24da-be52-486b-93ca-2d06588bdab0.png)"
    ]