Firewall / checklist for topics to explain.

[AdSchellevis]

Important notices

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• I have read the contributing guide lines at https://github.com/opnsense/docs/blob/master/CONTRIBUTING.md
• I have searched the existing issues and I am convinced that mine is new.

Is your feature request related to a problem? Please describe.

Reminder of topics to extend with functionality added over the years. (not intended as a complete list)

[ ] Firewall->Diagnostics->States - search query, describe visible columns and explain different state types
[x] Firewall->Aliases describe visible metadata (loaded entries and last changed)
[ ] Firewall->Diagnostics->Sessions describe columns and which type of traffic is visible here (states)