Update 02-system-hardening.md

[r3dg33k]

Summary :

If this closes an existing issue then add "closes #xxxx", where xxxx is the issue number

Description for the changelog :

Declaration:

• content meets the license for this project
• AI has not been used, or has been declared, in this pull request

Other info :

Thanks for submitting a pull request!

Please make sure you follow our Code of Conduct
and our contributing guidelines

Automated tests are run to check links, markdown and spelling

The pull request must pass these tests before it can be merged

[jgadsden]

thanks for the update @r3dg33k
could you revise it for the existing markdown rules and layout?

[jgadsden]

Thanks @r3dg33k
could you provide a summary for this PR? and a description for the changelog