Add missing versionadded directive.

Author: ZeroIntensity

Doc/c-api/function.rst

@@ -155,11 +155,15 @@ There are a few functions specific to Python functions.
    Return the annotations of the function object *op*. This can be a
    mutable dictionary or ``NULL``.
 
+   .. versionadded:: 3.0
+
 
 .. c:function:: PyObject *PyFunction_GET_ANNOTATIONS(PyObject *op)
 
    Equivalent to :c:func:`PyFunction_GetAnnotations`, but without error checking.
 
+   .. versionadded:: 3.0
+
 
 .. c:function:: int PyFunction_SetAnnotations(PyObject *op, PyObject *annotations)
 
@@ -168,6 +172,8 @@ There are a few functions specific to Python functions.
 
    Raises :exc:`SystemError` and returns ``-1`` on failure.
 
+   .. versionadded:: 3.0
+
 
 .. c:function:: int PyFunction_AddWatcher(PyFunction_WatchCallback callback)