--- a/botocore/docs/method.py~	2022-05-10 13:06:42.000000000 -0500
+++ b/botocore/docs/method.py	2022-05-11 14:29:40.467083093 -0500
@@ -101,13 +101,7 @@
     :param exclude: The names of the parameters to exclude from
         documentation.
     """
-    argspec = inspect.getfullargspec(method)
-    signature_params = inspect.formatargspec(
-        args=argspec.args[1:],
-        varargs=argspec.varargs,
-        varkw=argspec.varkw,
-        defaults=argspec.defaults,
-    )
+    signature_params = str(inspect.signature(method))
     signature_params = signature_params.lstrip('(')
     signature_params = signature_params.rstrip(')')
     section.style.start_sphinx_py_method(name, signature_params)