Clarify that `make clean` also runs `make stop`

assignments/basic/README.md

@@ -56,7 +56,7 @@ Before that, let's compile the incomplete `basic.p4` and bring up a switch in Mi
    ```bash
    make stop
    ```
-   And to delete all pcaps, build files, and logs:
+   Or, if you want to both stop mininet and delete all pcaps, build files, and logs:
    ```bash
    make clean
    ```

assignments/firewall/README.md

@@ -73,7 +73,7 @@ up a switch in Mininet to test its behavior.
    ```bash
    make stop
    ```
-   And to delete all pcaps, build files, and logs:
+    Or, if you want to both stop mininet and delete all pcaps, build files, and logs:
    ```bash
    make clean
    ```