[FIX] document: removed dangerous and useless commits

[FIX] document: removed dangerous and useless commits

These commits were introduce mostly at revision
1849.1.1 revid:hmo@tinyerp.com-20081111052750-zqzvr6oaihvt103t
in an attempt to fix an issue with transactions
originating from FTP connections.
This was wrong: the virtual FTP filesystem should
perform its own transaction management for each
operation, just like the RPC layer does it for
each request. Forcing a commit in the business
code during the course of a normal transaction is
totally *forbidden*!
In addition, the FTP layer now properly manages
its transactions, so the commit calls were useless
anyway.

bzr revid: odo@openerp.com-20111130120239-5fcavvpd14w056zb