[ADD] documentation for OpenUpgrade manager. how to create reference database.#4575

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legalsylvain wants to merge 1 commit intoOCA:documentationfrom grap:documentation-create-reference-database

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Commits on Oct 1, 2024

[ADD] documentation for OpenUpgrade manager. how to create reference database. replace old wiki. see https://github.com/grap/openupgrade_wiki_backup/blob/master/How-to-create-a-reference-database.md
legalsylvain
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