add the notebook example to car port docs (#30920)

* add the notebook example

* fix link

* add image

* no lfs

* no lfs

tools/car_porting/README.md

@@ -55,4 +55,12 @@ Traceback (most recent call last):
   File "/home/batman/xx/openpilot/openpilot/selfdrive/car/tests/test_models.py", line 380, in test_panda_safety_carstate
     self.assertFalse(len(failed_checks), f"panda safety doesn't agree with openpilot: {failed_checks}")
 AssertionError: 1 is not false : panda safety doesn't agree with openpilot: {'gasPressed': 116}
-```
+```
+
+### [tools/car_porting/examples/subaru_steer_temp_fault.ipynb](/tools/car_porting/examples/subaru_steer_temp_fault.ipynb)
+
+An example of searching through a database of segments for a specific condition, and plotting the results.
+
+![steer warning example](https://github.com/commaai/openpilot/assets/9648890/d60ad120-4b44-4974-ac79-adc660fb8fe2)
+
+*a plot of the steer_warning vs steering angle, where we can see it is clearly caused by a large steering angle change*

tools/car_porting/examples/subaru_steer_temp_fault.ipynb

@@ -6,7 +6,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# An example of searching through the database of segments for a specific condition, and plotting the results.\n",
+    "# An example of searching through a database of segments for a specific condition, and plotting the results.\n",
     "\n",
     "segments = [\n",
     "  \"c3d1ccb52f5f9d65|2023-07-22--01-23-20--6\",\n",