Use request instead of query method

source/devapi/querydb.rst

@@ -1,16 +1,15 @@
 Querying database
 -----------------
 
-To query database, you can use hte ``$DB::query()`` method.
+To query database, you can use the ``$DB::request()`` method and give it a full SQL query.
 
 .. warning::
 
-   Whether this is possible to query database directly using this method, it should be avoid when possible, and you'd better use :doc:`DBIterator <dbiterator>` instead.
+   Whether this is possible to use full SQL t query database using this method, it should be avoid when possible, and you'd better use :doc:`DBIterator <dbiterator>` instead.
 
-
-To make a database query that could not be done using ``$DB->request()``, to call SQL functions  (``NOW()``, ``ADD_DATE()``, ...) for example, you can use the ``query()`` method:
+To make a database query that could not be done using DBIterator (calling SQL functions such as ``NOW()``, ``ADD_DATE()``, ... for example), you can do:
 
 .. code-block:: php
 
    <?php
-   $DB->query('SELECT id FROM glpi_users WHERE end_date > NOW()');
+   $DB->request('SELECT id FROM glpi_users WHERE end_date > NOW()');