Fix indentation in docs/editor_integration.md (#2056)

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+[//]: # "NOTE: THIS FILE WAS AUTOGENERATED FROM CONTRIBUTING.md"
+
+# Contributing to _Black_
+
+Welcome! Happy to see you willing to make the project better. Have you read the entire
+[user documentation](https://black.readthedocs.io/en/latest/) yet?
+
+## Bird's eye view
+
+In terms of inspiration, _Black_ is about as configurable as _gofmt_. This is
+deliberate.
+
+Bug reports and fixes are always welcome! Please follow the
+[issue template on GitHub](https://github.com/psf/black/issues/new) for best results.
+
+Before you suggest a new feature or configuration knob, ask yourself why you want it. If
+it enables better integration with some workflow, fixes an inconsistency, speeds things
+up, and so on - go for it! On the other hand, if your answer is "because I don't like a
+particular formatting" then you're not ready to embrace _Black_ yet. Such changes are
+unlikely to get accepted. You can still try but prepare to be disappointed.
+
+## Technicalities
+
+Development on the latest version of Python is preferred. As of this writing it's 3.9.
+You can use any operating system. I am using macOS myself and CentOS at work.
+
+Install all development dependencies using:
+
+```console
+$ pipenv install --dev
+$ pipenv shell
+$ pre-commit install
+```
+
+If you haven't used `pipenv` before but are comfortable with virtualenvs, just run
+`pip install pipenv` in the virtualenv you're already using and invoke the command above
+from the cloned _Black_ repo. It will do the correct thing.
+
+Non pipenv install works too:
+
+```console
+$ pip install -r test_requirements
+$ pip install -e .[d]
+```
+
+Before submitting pull requests, run lints and tests with the following commands from
+the root of the black repo:
+
+```console
+# Linting
+$ pre-commit run -a
+
+# Unit tests
+$ tox -e py
+
+# Optional Fuzz testing
+$ tox -e fuzz
+
+# Optional CI run to test your changes on many popular python projects
+$ black-primer [-k -w /tmp/black_test_repos]
+```
+
+### Docs Testing
+
+If you make changes to docs, you can test they still build locally too.
+
+```console
+$ pip install -r docs/requirements.txt
+$ pip install [-e] .[d]
+$ sphinx-build -a -b html -W docs/ docs/_build/
+```
+
+## black-primer
+
+`black-primer` is used by CI to pull down well-known _Black_ formatted projects and see
+if we get source code changes. It will error on formatting changes or errors. Please run
+before pushing your PR to see if you get the actions you would expect from _Black_ with
+your PR. You may need to change
+[primer.json](https://github.com/psf/black/blob/master/src/black_primer/primer.json)
+configuration for it to pass.
+
+For more `black-primer` information visit the
+[documentation](https://github.com/psf/black/blob/master/docs/black_primer.md).
+
+## Hygiene
+
+If you're fixing a bug, add a test. Run it first to confirm it fails, then fix the bug,
+run it again to confirm it's really fixed.
+
+If adding a new feature, add a test. In fact, always add a test. But wait, before adding
+any large feature, first open an issue for us to discuss the idea first.
+
+## Finally
+
+Thanks again for your interest in improving the project! You're taking action when most
+people decide to sit and watch.