Google-drive – Google docs not sending notification

@Pacerier's answer is correct — for a spreadsheet. For a word processing document or presentation, that menu does not exist.

As far as I have found, word processing and presentation documents provide notifications for updates to comments, but not the content of the document. Comment notifications seem to be enabled by default and can be changed by clicking the Comments button (next to the Share button, in the top right area of the page) and then Notification Settings.

If a person is maliciously adding you as an editor (or owner) to documents, you could report the Google Drive/Docs abuse to Google.

If it's a friend who's behaving anti-socially, tell him or her why you don't want to share/own the document. Unfortunately, in the email that's generated, I can't see any way to "refuse" the share in the email. Google Docs is not a social network, per se, where you'd find such features (ignoring requests).

From the tests I did briefly, I can only assign one "owner" of a document. An editor of a document can remove himself from the sharing. If you're just an editor, deleting the document won't remove you from having the permission (although the document doesn't show up either in the Trash or the All Items).