In chapter 13 the `property_ids` field is defined as the inverse of a
`user_id` field. But in chapter 8 when the salesperson field is added,
no such name is given to it.
This commit adapts the description to reference the general concept of
the field used to link to the salesperson instead of an actual field
identifier.
task-3381757
closesodoo/documentation#4901
X-original-commit: 3a131c829a
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>
This commit also replaces references to the "Building a module"
tutorial by references to the "Getting started" tutorial.
task-2991663
Part-of: odoo/documentation#3644
