[FIX] replace broken link in error message

[paul-leydier]

Hi everyone!

There's an error log when the Smartnode fails to delete a non-existing folder when changing the network in the config:

The Smartnode could not automatically change networks for you, so you will have to run the steps manually. Please follow the steps laid out in the Node Operator's guide (https://docs.rocketpool.net/guides/node/mainnet.html).

Unless I'm mistaken, in this message, the link is broken.
I suggest replacing it with the Creating a Standard Rocket Pool Node with Docker
page, but feel free to update my change with another page if it could make more sense.

[jclapis]

This is a good point - it used to refer to this page, which has since been moved:

https://docs.rocketpool.net/guides/legacy/upgrading.html

I think we probably need a real page for safely swapping networks that this can point to; not just one for upgrading from Rocket Pool betas. I'll look into adding one and update this link. Thanks for the report!