DOC: dvc import can access non-DVC Git repositories

[chatcannon]

Updating the command reference for the changes in
iterative/dvc#3020

Fixes #898

[shcheklein]

@chatcannon thanks! does it affect dvc get command as well?

[jorgeorpinel]

@shcheklein I think this was already implemented for dvc get before, see iterative/dvc/pull/2837. And its cmd ref already reflects this.

[jorgeorpinel]

Thanks for this! Please try to compare the whole doc vs. https://dvc.org/doc/command-reference/get to see if there's any other relevant changes 🙂

[shcheklein]

@jorgeorpinel let's take it over, fix what's left and merge

[chatcannon]

The 'prettier' tool is failing (with no information as to why) and I can't be bothered to faff around installing npm and all that mess just to format my code. Someone else do it please.

[jorgeorpinel]

All the checks are passing actually Also, the formatting hooks are installed automatically with Yarn. This is a Node project after all, pretty quick to run a package manager... But anyway, feel free to unsubs, I got this one 🙂

[jorgeorpinel]

He guys actually after Chris merged from master not many changes are left in the PR. I guess we already did most of this in another recent PR. I'm closing it but will review each commit to make sure nothing was missed. Thanks again!