docs: comma 3X to comma four (#37009)

* comma 3X -> comma four

* add comma four ports image

README.md

@@ -17,7 +17,7 @@
   <span> · </span>
   <a href="https://discord.comma.ai">Community</a>
   <span> · </span>
-  <a href="https://comma.ai/shop">Try it on a comma 3X</a>
+  <a href="https://comma.ai/shop">Try it on a comma four</a>
 </h3>
 
 Quick start: `bash <(curl -fsSL openpilot.comma.ai)`
@@ -42,10 +42,10 @@ Using openpilot in a car
 ------
 
 To use openpilot in a car, you need four things:
-1. **Supported Device:** a comma 3X, available at [comma.ai/shop](https://comma.ai/shop/comma-3x).
-2. **Software:** The setup procedure for the comma 3X allows users to enter a URL for custom software. Use the URL `openpilot.comma.ai` to install the release version.
+1. **Supported Device:** a comma four, available at [comma.ai/shop](https://comma.ai/shop/comma-3x).
+2. **Software:** The setup procedure for the comma four allows users to enter a URL for custom software. Use the URL `openpilot.comma.ai` to install the release version.
 3. **Supported Car:** Ensure that you have one of [the 275+ supported cars](docs/CARS.md).
-4. **Car Harness:** You will also need a [car harness](https://comma.ai/shop/car-harness) to connect your comma 3X to your car.
+4. **Car Harness:** You will also need a [car harness](https://comma.ai/shop/car-harness) to connect your comma four to your car.
 
 We have detailed instructions for [how to install the harness and device in a car](https://comma.ai/setup). Note that it's possible to run openpilot on [other hardware](https://blog.comma.ai/self-driving-car-for-free/), although it's not plug-and-play.