Added some precision about the module purpose

I tried to improve the description to be more precise about what this module does.

partner_affiliate/readme/DESCRIPTION.rst

@@ -1,5 +1,9 @@
-The field 'Contacts & Addresses' is focused on storing contact information about the company's employees and the
-company itself.
-This module adds a new field 'Affiliates' on the partner form and changes 'Contacts & Addresses'
-to only show individuals. This new field is in contrast to 'Contacts & Addresses' focussed on
-storing information about holding companies and other company structures.
+This module adds a new tab "Affiliates" in the partner form view and modifies the purpose of the tab "Contacts & Addresses". This new tab "Affiliates" is visible only if the partner is a company.
+
+The existing tab "Contacts & Addresses" in Odoo Vanilla is focused on storing contact information about the company's employees and the company itself.
+
+With this module :
+
+- The tab "Affiliates" is focussed on storing information about holding companies and other company structures.
+
+- The tab "Contacts & Addresses" only shows individuals who are linked to the company (employees or others).