Update CHANGES for PR #9518

Author: tk0miya

CHANGES

@@ -22,6 +22,8 @@ Bugs fixed
 
 * #9487: autodoc: typehint for cached_property is not shown
 * #9509: autodoc: AttributeError is raised on failed resolving typehints
+* #9518: autodoc: autodoc_docstring_signature does not effect to ``__init__()``
+  and ``__new__()``
 * #9481: autosummary: some warnings contain non-existing filenames
 * #9481: c domain: some warnings contain non-existing filenames
 * #9481: cpp domain: some warnings contain non-existing filenames