There are few styling issues in RHEL 9 documentation .

• There are optional steps that start with: 'Optionally,' when they should start with 'Optional:'
• Removal of "Next steps" section from all the titles .
• Sagar's feedback on Using systemd title :https://docs.google.com/document/d/1EGPwj2towsBQNqfLddbul0aZZMqvZX24evJWA1-BMwY/edit?tab=t.0