Document how to Add multiselect default value support

[fakela]

see 1045

We need to update the docs with this information!

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[deborahsalves]

Hi, I'm new, but I'd like to help :)

[fakela]

Hi @deborahsalves, welcome!

This is where the information should be added https://docs.mautic.org/en/contacts/manage-custom-fields

And this is where you can get more information on the feature https://github.com/mautic/mautic/pull/10415 and what needs to be updated

[Iheanacho-ai]

hi is this issue still open id like to contribute