updated docker hero docs

docs/hero_mdbook_docker.md

@@ -41,10 +41,16 @@ Note that you will need to adjust the local path of the git repo and the docker
   ```
   git config --global --add safe.directory /root/code/git.ourworld.tf/tfgrid/info_tfgrid
   ```
-- You can now use hero normally, e.g. with **projectinca**:
-  ```
-  hero mdbook -u https://git.ourworld.tf/tfgrid/info_tfgrid/src/branch/main/heroscript/projectinca -gp
-  ```
+- You can now use Hero normally, e.g. with **projectinca**
+  - With a URL:
+    ```
+    hero mdbook -u https://git.ourworld.tf/tfgrid/info_tfgrid/src/branch/main/heroscript/projectinca
+    ```
+  - With a path:
+    ```
+    hero mdbook -p /root/code/git.ourworld.tf/tfgrid/info_tfgrid/heroscript/projectinca
+    ```
+    - In this case, you can modify the mdbook on the local machine's git repo that you set in the prerequisites section and the changes will be shown on the docker path
 - To view the mdbook on your local browser, run the lines:
   ```
   cd ~/hero/var/mdbuild/projectinca/