feat(nc-upgrade-33): Add notes related to IResult::fetch/fetchAll

Signed-off-by: Carl Schwan <[email protected]>

Author: CarlSchwan

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_33.rst

@@ -88,7 +88,8 @@ Added Events
 Added APIs
 ^^^^^^^^^^
 
-- TBD
+- We now expose ``\OCP\DB\IResult::iterateAssociative``, ``\OCP\DB\IResult::iterateNumeric`` from doctrine/dbal.
+  These two methods returns iterator and can be directly used in a `foreach` to iterate over a SQL query result.
 
 Changed APIs
 ^^^^^^^^^^^^
@@ -98,7 +99,11 @@ Changed APIs
 Deprecated APIs
 ^^^^^^^^^^^^^^^
 
-- TBD
+- The ``\OCP\DB\IResult::fetch`` and ``\OCP\DB\IResult::fetchAll`` are soft-deprecated. Instead you can use
+  ``\OCP\DB\IResult::fetchAssociative``, ``\OCP\DB\IResult::fetchNumeric`` and ``\OCP\DB\IResult::fetchOne``
+  as replacement for ``\OCP\DB\IResult::fetch``; and ``\OCP\DB\IResult::fetchAllAssociative``,
+  ``\OCP\DB\IResult::fetchAllNumeric`` and ``\OCP\DB\IResult::fetchFirstColumn`` as replacement for 
+  ``\OCP\DB\IResult::fetchAll``.
 
 Removed APIs
 ^^^^^^^^^^^^