[IMP] doc: remove calls to @api.multi and @api.one

Those two decorators are removed/deprecated since recent commits but some references remained in the documentation.

api.multi is deprecated since https://github.com/odoo/odoo/commit/cc62447a44c2cf4e2edaf8a1f6d94520e799ddd9
api.one was removed with https://github.com/odoo/odoo/commit/407f1f6cdb87a59bbad9f853078d7345cdf9f60c



closes odoo/odoo#35261

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

doc/howtos/backend/exercise-copy-override

@@ -5,11 +5,10 @@
 diff --git a/openacademy/models.py b/openacademy/models.py
 --- a/openacademy/models.py
 +++ b/openacademy/models.py
-@@ -14,6 +14,20 @@ class Course(models.Model):
+@@ -14,6 +14,19 @@ class Course(models.Model):
      session_ids = fields.One2many(
          'openacademy.session', 'course_id', string="Sessions")
- 
-+    @api.multi
+
 +    def copy(self, default=None):
 +        default = dict(default or {})
 +

doc/howtos/backend/exercise-wizard-action

@@ -19,12 +19,11 @@ Index: addons/openacademy/wizard.py
 ===================================================================
 --- addons.orig/openacademy/wizard.py
 +++ addons/openacademy/wizard.py
-@@ -12,3 +12,8 @@
+@@ -12,3 +12,7 @@
      session_id = fields.Many2one('openacademy.session',
          string="Session", required=True, default=_default_session)
      attendee_ids = fields.Many2many('res.partner', string="Attendees")
 +
-+    @api.multi
 +    def subscribe(self):
 +        self.session_id.attendee_ids |= self.attendee_ids
 +        return {}

doc/howtos/backend/exercise-wizard-multi

@@ -15,22 +15,21 @@ Index: addons/openacademy/wizard.py
 ===================================================================
 --- addons.orig/openacademy/wizard.py
 +++ addons/openacademy/wizard.py
-@@ -6,14 +6,15 @@ class Wizard(models.TransientModel):
+@@ -6,13 +6,14 @@ class Wizard(models.TransientModel):
      _name = 'openacademy.wizard'
      _description = "Wizard: Quick Registration of Attendees to Sessions"
- 
+
 -    def _default_session(self):
 -        return self.env['openacademy.session'].browse(self._context.get('active_id'))
 +    def _default_sessions(self):
 +        return self.env['openacademy.session'].browse(self._context.get('active_ids'))
- 
+
 -    session_id = fields.Many2one('openacademy.session',
 -        string="Session", required=True, default=_default_session)
 +    session_ids = fields.Many2many('openacademy.session',
 +        string="Sessions", required=True, default=_default_sessions)
      attendee_ids = fields.Many2many('res.partner', string="Attendees")
- 
-     @api.multi
+
      def subscribe(self):
 -        self.session_id.attendee_ids |= self.attendee_ids
 +        for session in self.session_ids:

doc/reference/guidelines.rst

@@ -595,12 +595,8 @@ on self to treat each record.
         for record in self:
             record.do_cool_stuff()
 
-Avoid to use ``api.one``  decorator : this will probably not do what you expected,
-and extending a such method is not as easy than a *api.multi* method, since it
-returns a list of result (ordered by recordset ids).
-
 For performance issue, when developping a 'stat button' (for instance), do not
-perform a ``search`` or a ``search_count`` in a loop in a ``api.multi`` method. It
+perform a ``search`` or a ``search_count`` in a loop. It
 is recommended to use ``read_group`` method, to compute all value in only one request.
 
 .. code-block:: python

doc/reference/orm.rst

@@ -588,8 +588,7 @@ return lists of ids, there is also a decorator managing this:
     No effect if the method is called in new API style, but transforms the
     recordset into a list of ids when called from the old API style::
 
-        >>> @api.multi
-        ... @api.returns('self')
+        >>> @api.returns('self')
         ... def some_method(self):
         ...     return self
         >>> new_style_model = env['a.model'].browse(1, 2, 3)
@@ -1165,9 +1164,9 @@ Porting from the old API to the new API
 * **remove** all ``onchange`` methods on computed fields. Computed fields are
   automatically re-computed when one of their dependencies is changed, and
   that is used to auto-generate ``onchange`` by the client
-* the decorators :func:`~odoo.api.model` and :func:`~odoo.api.multi` are
+* the decorator :func:`~odoo.api.model` is
   for bridging *when calling from the old API context*, for internal or pure
-  new-api (e.g. compute) they are useless
+  new-api (e.g. compute) it is useless
 * remove :attr:`~odoo.models.Model._default`, replace by ``default=``
   parameter on corresponding fields
 * if a field's ``string=`` is the titlecased version of the field name::
@@ -1186,8 +1185,6 @@ Porting from the old API to the new API
 * the normal new-api import is ``from odoo import fields, models``. If
   compatibility decorators are necessary, use ``from odoo import api,
   fields, models``
-* avoid the :func:`~odoo.api.one` decorator, it probably does not do what
-  you expect
 * remove explicit definition of :attr:`~odoo.models.Model.create_uid`,
   :attr:`~odoo.models.Model.create_date`,
   :attr:`~odoo.models.Model.write_uid` and

doc/webservices/iap/03-callback

@@ -15,7 +15,7 @@ Index: coalroller/coalroller/models/res_partner.py
 ===================================================================
 --- /dev/null
 +++ coalroller/coalroller/models/res_partner.py
-@@ -0,0 +1,22 @@
+@@ -0,0 +1,21 @@
 +# -*- coding: utf-8 -*-
 +from odoo import api, models
 +from odoo.addons.iap import jsonrpc, InsufficientCreditError
@@ -25,7 +25,6 @@ Index: coalroller/coalroller/models/res_partner.py
 +DEFAULT_ENDPOINT = 'http://localhost:8070'
 +class Partner(models.Model):
 +    _inherit = 'res.partner'
-+    @api.multi
 +    def action_partner_coalroll(self):
 +        # fetch the user's token for our service
 +        user_token = self.env['iap.account'].get('coalroller')