Link to upgrade FAQs upon error

[nywilken]

Currently, if an error in encountered when trying to upgrade the Exercism CLI via the upgrade command an error is provided, but no additional guidance on how to resolve is provided to the user.

This request is to update the CLI upgrade command to provide a link to common upgrade issues so that the user can try to resolve the issue on their own.

The messaging should be something like the following.

We were not able to write your file because we had an error:

{{raw error}}

Please check the FAQ on upgrading problems.

https://exercism.io/faq#cli-upgrade

[NobbZ]

This also implies that we need such a section on the website-FAQ ;)

[nywilken]

Please let me know if this is the correct repo for this issue. exercism/website-copy#261

[kytrinyx]

@nywilken that's the correct repo!

[nywilken]

Thanks @kytrinyx

[nywilken]

Closed with PR #752

[Smarticles101]

@exercism/cli doesn't look like this was ever closed...

[nywilken]

Thanks @Smarticles101