Fix some commands.

Author: rhodrin

README.md

@@ -19,7 +19,7 @@ For attendees who would like a more hands on experience with Devito, during the
 
 To access the workshop material:
 * If using the Azure VM's provided:
-    * Go to: http://devito-at-transform2020.uksouth.cloudapp.azure.com
+    * Go to: http://51.132.27.219/hub/login
     * Login using your Github credentials
     * New -> Terminal (A bash script will automatically initialize your environment)
     * Navigate to ```transform2020/workshop_notebooks``` and enjoy!

workshop_notebooks/03_propagators-acoustic.ipynb

@@ -557,7 +557,7 @@
     "As a quick exercise, let us run this script with `mpirun` and satisfy ourselves that it returns the same results when run over 1 and 2 ranks:\n",
     "- Before running with mpi we first need to install `mpi4py`. To do so, run the two following commands:\n",
     "    - `sudo apt install mpich -y`\n",
-    "    - Then, in the `Devito` directory (`~/devito`) `pip install -r requirements-optional.txt`\n",
+    "    - Then, in the `Devito` directory (`~/devito`) `pip install -r requirements-optional.txt --user`\n",
     "- In the `additional_material` folder within the `transform2020` directory first run the script in serial: `python acoustic_script.py`.\n",
     "- Then run over two mpi processes (`DEVITO_MPI=1 mpirun -np 2 python acoustic_script.py`) and check the resultant `norm` is the same. (Note 1: When running over two mpi processes each rank will print the norm to screen. Note 2: If executing via the jupyterhub terminal please do not run over 'too' many mpi processes as this may cause issues for other users.)"
    ]