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Document target version inference (#4048)

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docs/usage_and_configuration/the_basics.md
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@ -67,6 +67,10 @@ In a [configuration file](#configuration-via-a-file), you can write:
target-version = ["py38", "py39", "py310", "py311"]
```
By default, Black will infer target versions from the project metadata in
`pyproject.toml`, specifically the `[project.requires-python]` field. If this does not
yield conclusive results, Black will use per-file auto-detection.
_Black_ uses this option to decide what grammar to use to parse your code. In addition,
it may use it to decide what style to use. For example, support for a trailing comma
after `*args` in a function call was added in Python 3.5, so _Black_ will add this comma