[FIX] doc: remove support for IE 11.

Since Odoo V13, ES6 is supported and we therefore do not support IE 11
anymore.

closes odoo/odoo#40661

X-original-commit: 9071a25394aa7a1749dc497fccea095bc8261181
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

doc/reference/javascript_cheatsheet.rst

@@ -493,8 +493,6 @@ Testing asynchronous code
         In the tests code, we support the latest version of Javascript, including primitives like `async` and `await`. This makes using and waiting for promises very easy.
         Most helper methods also return a promise (either by being marked `async` or by returning a promise directly.
 
-        .. note:: Version 12 and 13 of Odoo supports IE11, for which it is not possible to polyfill async and await. We do not consider that it is important that the tests runs on these browser though.
-
         .. code-block:: javascript
 
                 var testUtils = require('web.test_utils');

doc/setup/deploy.rst

@@ -592,15 +592,18 @@ Supported Browsers
 
 Odoo is supported by multiple browsers for each of its versions. No
 distinction is made according to the browser version in order to be
-up-to-date. Odoo is supported on the current browser version. The list
-of the supported browsers is the following:
+up-to-date. Odoo is supported on the current browser version. We support
+the following browsers:
 
-- IE11,
-- Mozilla Firefox,
-- Google Chrome,
-- Safari,
+- Mozilla Firefox
+- Google Chrome
+- Safari
 - Microsoft Edge
 
+.. note::
+
+    Since Odoo 13.0, ES6 is supported.  Therefore, IE support is dropped.
+
 
 .. [#different-machines]
     to have multiple Odoo installations use the same PostgreSQL database,