[FIX] developer/guidelines: do not mention deprecated xml tags

act_window & report xml tags have been deprecated by
https://github.com/odoo/odoo/commit/6835aeb0de6895f7f4d6b23e0b4654465ef21d6a
two years ago, we should avoid mentioning them in the guidelines.

Furthermore, in 17.0 they won't be available anymore.

closes odoo/documentation#2862

X-original-commit: 758463edd4
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

content/contributing/development/coding_guidelines.rst

@@ -276,10 +276,8 @@ Odoo supports custom tags acting as syntactic sugar:
 
 - menuitem: use it as a shortcut to declare a ``ir.ui.menu``
 - template: use it to declare a QWeb View requiring only the ``arch`` section of the view.
-- report: use to declare a :ref:`report action <reference/actions/report>`
-- act_window: use it if the record notation can't do what you want
 
-The 4 first tags are preferred over the *record* notation.
+These tags are preferred over the *record* notation.
 
 
 XML IDs and naming