bug#71952: documentation inaccuracy?

[chris]

This section of the documentation seems innacurate,

https://guix.gnu.org/manual/devel/en/html_node/Invoking-guix-home.html#index-home-generations

> When specifying a negative value such as -1, you must precede it with -- to 
> prevent it from being parsed as an option. For example:
>
> guix home switch-generation -- -1

Running the same command here gives the following result

> $ guix home switch-generation -- -1
>
> guix home: error: -1: extraneous command

Instead, `guix home roll-back` and `guix home switch-generation +1` can be used.