odoo/documentation#15675

Created by Rex Hu (rexhu)
Merged at 224bc741a05e5a54e0297c3feab7ca0b724eceae

Statuses:

label
odoo-dev:17.0-email-clarify-dkim-cname-rexhu
head
eb801dfbd7c1cbdc6640d3095fd44c00168013de
merged
4 days ago by Felicia Kuan (feku)
odoo/documentation
17.0 #15675
18.0 #15676
saas-18.2 #15706 missing r+
saas-18.3 #15707 missing r+
saas-18.4 #15709 missing r+
19.0 #15710 missing r+
master #15711 missing r+

[IMP] email: clarify domain formatting for dkim config

key changes @ lines 75–109:
- clarified formatting examples for dkim cname configuration
- separated dkim into subsections for clarity & to avoid excessive callouts
- see documentation task card

other:
- added two lines that were different from 18.0/19.0
- this PR changes the dkim section only; full article refresh planned for future task

This 17.0 PR can be FWP up to master.