Update BT description.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@7591 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/erp5_core/bt/description

 ERP5 Core is the basic template for ERP5.
 
-NOTE: You must not include the portal type Business Template or the workflows for Business Template due to bootstrap problems. Look at ERP5Site.py in the Product ERP5 for more details.
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+NOTE: You must not include the portal type Business Template or the workflows for Business Template due to bootstrap problems. Look at ERP5Site.py in the Product ERP5 for more details.
+
+NOTE 2: Everything which is not required for installing more business templates should not be put in erp5_core.
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