Update virtual environment activation instructions (#36)

Author: connesy

README.md

@@ -64,7 +64,7 @@ $ sudo apt install python3.10-venv
 The `-venv` part is necessary to be able to use this system python to create virtual environments.
 
 ## Activating and deactivating the virtual environment
-To activate the virtual environment, from the folder containing `.venv` run
+To activate the virtual environment, place yourself _in the folder containing_ the `.venv` folder, then run
 ```console
 $ venv activate
 ```

src/venv-cli/venv.sh

@@ -144,6 +144,7 @@ venv::activate() {
     echo "venv activate"
     echo
     echo "Activate the virtual environment located in the current folder."
+    echo "This command should be run from the folder containing the '.venv' folder."
     echo
     echo "Examples:"
     echo "$ venv activate"