Fix: #525: How to fix autocomplete on debian/ubuntu

[dashohoxha]

Instructions for fixing bash autocomplete on debian/ubuntu. Fix #525

[shcheklein]

@dashohoxha looks good! Please, check the docs contributing guide and fix small stylistic issues here and there.

[dashohoxha]

I fixed the formatting (with prettier) and also fenced code blocks (although I think they are not necessary in this case, because there are no dvc commands).

But please let's keep "it is" and "does not" as they are. I know English as well as you do, and I know the difference between them and their short forms. It is not only about more/less formal but it is also about emphasis. They sound better to me the way they are.

[shcheklein]

thanks 🎉 !

[jorgeorpinel]

My only comment on the "does not" and "is not" etc is that we want the docs, as much as possible, to sound like the same person wrote it all for familiarity. It's about consistency, not correctness. Thus I'm changing them in 2b96e0e (for my next PR). Thanks