tour: Clarify usage of any as an alias for interface{} in fmt.Print description

[desabuh]

Context: https://go.dev/tour/methods/14

In the Methods and Interfaces - Empty Interface section, the current text states:

For example, fmt.Print takes any number of arguments of type interface{}

While this statement is technically correct, the actual implementation of fmt.Print in Go uses any instead of interface{}. This could cause confusion for newcomers, as the example uses the older syntax while the implementation reflects the modern alias.

I think it'll be useful to update the text to clarify that any is an alias for interface{}, ensuring consistency with the source code state