docs.inspect: Fix BoundArguments example. Issue #22998.
diff --git a/Doc/library/inspect.rst b/Doc/library/inspect.rst
index 3ac66d8..3d2132f 100644
--- a/Doc/library/inspect.rst
+++ b/Doc/library/inspect.rst
@@ -678,7 +678,8 @@
         ((5,), {})
 
         >>> for param in sig.parameters.values():
-        ...     if param.name not in ba.arguments:
+        ...     if (param.name not in ba.arguments
+        ...             and param.default is not param.empty):
         ...         ba.arguments[param.name] = param.default
 
         >>> ba.args, ba.kwargs