x/website: It looks like there's a copy paste error in the "Create a Go module" tutorial

> Create a module -- Write a small module with functions you can call from another module.
> Call your code from another module -- Add simple error handling.
> Return and handle an error -- Add simple error handling.
> Return a random greeting -- Handle data in slices (Go's dynamically-sized arrays). 

The text in the 2nd list item is a duplicate of the text in the 3rd list item.