[DOC] mail: update test performance counters
[DOC] mail: update test performance counters

A test_mail only counter was not updated correctly after changes done
in user assignation notification (see a6e1324873760536a95af98cf882a61a9555f09a).

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo