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Signed-off-by: Morgan Funtowicz <morgan@huggingface.co>

This ensures compatibility with zsh.

Fix #2316.

Use -e only in docs targeted at contributors.

If a user copy-pastes  command line with [--editable], they will hit
an error. If they don't know the --editable option, we're giving them
a choice to make before they can move forwards, but this isn't a choice
they need to make right now.

Also provide shortcuts in a Makefile.

It's superseded by the "docs" extras.

This should fix API docs, which went AWOL with yesterday's changes.

cc @lysandrejik