remove obsolete comment

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@44773 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_pdm/bt/comment

-WARNING! When upgrading from version <=1.0rc5, make sure you upgrade erp5_trade to 1.0rc17 or above before. Else, you might lose the supply modules.
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bt5/erp5_pdm/bt/description

 ERP5 Product Data Management
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-Includes Supplies
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bt5/erp5_pdm/bt/revision

-558
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+559
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