Security zones docs wants you to multiselect src/dest but no such thing is possible

[blackxored]

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Describe the issue

https://docs.opnsense.org/manual/how-tos/security-zones.html#id6

In this section about security zones and policies it is implied that we could use a "multiselect" feature to select multiple aliases in the Source/Destination fields given those are firewall groups. This is not possible as the control is just a standard dropdown that only allows selecting one item at a time, as is pretty much anywhere in the OPNsense UI. The emphasis in the fact this GUI rule is supposed to create multiple pf rules makes me think that this was possible at some point, but the documentation is outdated now.

Suggestions

Suggest to create invidual rules using single source and single destination, if it is confirmed that no such multiselect functionality exists.

Version affected

OPNsense 24.7.12-amd64

Describe alternatives you considered

Will create individual rules after I get some confirmation that I'm not misreading or missing something.

[AdSchellevis]

planned for 25.1 (opnsense/core@1293c51, opnsense/core@0dac1d6), documentation is a bit ahead on this part.