acc: docs - database column constraint alteration for acc_extra_nullable and cdr_extra_nullable [skip ci]

Pre-Submission Checklist

Type Of Change

Checklist:

Description

Documentation update related to #2531 (comment)


You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2550

Commit Summary

File Changes

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