Upgrader - Display note about token formatting

[totten]

Overview

Improve communications about tokens that may generate different output.

This is a follow-up to #19806

Depends: https://lab.civicrm.org/documentation/docs/sysadmin/-/merge_requests/306/

Ping: @eileenmcnaughton

Before

No upgrade notice

After

[civibot]

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[eileenmcnaughton]

@totten I think I would go further and say 'some mail merge tokens for custom fields'

[totten]

@eileenmcnaughton I thought it affected both some custom fields and some core fields (eg contact.created_date)?

[eileenmcnaughton]

@totten only in that some fields that didn't work now do

[eileenmcnaughton]

@totten specifically it fixes the 2 issues that we had about received contact.hash not working

[eileenmcnaughton]

I'm going to merge this - the upgrade notes can cover the specific fields - only custom fields are CHANGED. Some additional non-custom-fields are resolved