tools: update README (#36531)

update readme

tools/camerastream/README.md

@@ -39,7 +39,7 @@ Decode the stream with `compressed_vipc.py`:
 
 To actually display the stream, run `watch3` in separate terminal:
 
-```cd ~/openpilot/selfdrive/ui/ && ./watch3```
+```cd ~/openpilot/selfdrive/ui/ && ./watch3.py```
 
 ## compressed_vipc.py usage
 ```
@@ -62,5 +62,5 @@ options:
 ## Example:
 ```
 cd ~/openpilot/tools/camerastream && ./compressed_vipc.py comma-ffffffff --cams 0
-cd ~/openpilot/selfdrive/ui/ && ./watch3
+cd ~/openpilot/selfdrive/ui/ && ./watch3.py
 ```

tools/replay/README.md

@@ -88,7 +88,7 @@ To visualize the replay within the openpilot UI, run the following commands:
 
 ```bash
 tools/replay/replay <route-name>
-cd selfdrive/ui && ./ui
+cd selfdrive/ui && ./ui.py
 ```
 
 ## Work with plotjuggler
@@ -110,7 +110,7 @@ simply replay a route using the `--dcam` and `--ecam` flags:
 cd tools/replay && ./replay --demo --dcam --ecam
 
 # then start watch3
-cd selfdrive/ui && ./watch3
+cd selfdrive/ui && ./watch3.py
 ```
 
 ![](https://i.imgur.com/IeaOdAb.png)