docs: fix FIH example command in design.md
@@ -1468,8 +1468,8 @@ are issued from the MCUboot source directory):
```sh
$ mkdir docker
$ ./ci/fih-tests_install.sh
-$ FIH_LEVEL=MCUBOOT_FIH_PROFILE_MEDIUM BUILD_TYPE=RELEASE SKIP_SIZE=2 \
- DAMAGE_TYPE=SIGNATURE ./ci/fih-tests_run.sh
+$ FIH_LEVEL=MEDIUM BUILD_TYPE=RELEASE SKIP_SIZE=2 DAMAGE_TYPE=SIGNATURE \
+ ./ci/fih-tests_run.sh
```
On the travis CI the environment variables in the last command are set based on
the configs provided in the `.travis.yaml`
