refs #8025 README: venv doc improved

README.md

@@ -15,7 +15,6 @@ python3 -m venv venv
 source venv/bin/activate
 pip install --upgrade pip ansible==10.1.0 ansible-builder==3.1.0
 pip install -r requirements.txt
-deactivate
 ```
 
 Install dependencies.
@@ -28,6 +27,11 @@ Before running any Ansible command, activate the Python virtual environment.
 source venv/bin/activate
 ```
 
+Once you're done, deactivate the virtual environment.
+```
+deactivate
+```
+
 ## Run playbook
 
 Before merging changes into protected branches, playbooks should be tested