Update the output of a code snippet in docs (#5511)

Author: vvsagar

guide/src/function/signature.md

@@ -94,14 +94,13 @@ import mymodule
 mc = mymodule.MyClass()
 print(mc.method(44, False, "World", 666, x=44, y=55))
 print(mc.method(num=-1, name="World"))
-print(mc.make_change(44, False))
+print(mc.make_change(44))
 ```
 Produces output:
 ```text
-py_args=('World', 666), py_kwargs=Some({'x': 44, 'y': 55}), name=Hello, num=44
-py_args=(), py_kwargs=None, name=World, num=-1
+num=44 (was previously=-1), py_args=(False, 'World', 666), name=Hello, py_kwargs=Some({'x': 44, 'y': 55})
+num=-1 (was previously=44), py_args=(), name=World, py_kwargs=None
 num=44
-num=-1
 ```
 
 > Note: to use keywords like `struct` as a function argument, use "raw identifier" syntax `r#struct` in both the signature and the function definition: