update deprecation docs

doc/en/deprecations.rst

@@ -72,13 +72,7 @@ Becomes:
 
 
 
-``Node.get_marker``
-~~~~~~~~~~~~~~~~~~~
-
-.. deprecated:: 3.6
 
-As part of a large :ref:`marker-revamp`, :meth:`_pytest.nodes.Node.get_marker` is deprecated. See
-:ref:`the documentation <update marker code>` on tips on how to update your code.
 
 
 marks in ``pytest.mark.parametrize``
@@ -477,3 +471,21 @@ Removed all ``py.test-X*`` entry points. The versioned, suffixed entry points
 were never documented and a leftover from a pre-virtualenv era. These entry
 points also created broken entry points in wheels, so removing them also
 removes a source of confusion for users.
+
+
+``Node.get_marker``
+~~~~~~~~~~~~~~~~~~~
+
+*removed in version 4.1*
+
+As part of a large :ref:`marker-revamp`, :meth:`_pytest.nodes.Node.get_marker` is deprecated. See
+:ref:`the documentation <update marker code>` on tips on how to update your code.
+
+
+``somefunction.markname``
+~~~~~~~~~~~~~~~~~~~~~
+
+* Removed in version 4.1
+
+As part of a large :ref:`marker-revamp` we already deprecated using ``MarkInfo``
+the only correct way to get markers of an element is via ``node.iter_markers([name]``.