gestion/comptes.md: [cooperative] add details for `itopie.salaries`
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This complements aa80c526ea16eff92bd66b15dd853d4cc7c6976d, and fixes <https://odoo.itopie.ch/web#model=helpdesk.ticket&id=HT00732>, <https://odoo.itopie.ch/web#model=helpdesk.ticket&id=HT00715> and <https://odoo.itopie.ch/web#model=helpdesk.ticket&id=HT00710>.