Remove reference to old scripts extras feature (#8903)

Author: Secrus

docs/pyproject.md

@@ -349,13 +349,6 @@ my_package_cli = 'my_package.console:run'
 
 Here, we will have the `my_package_cli` script installed which will execute the `run` function in the `console` module in the `my_package` package.
 
-To specify a script that [depends on an extra](#extras), you may provide an entry as an inline table:
-
-```toml
-[tool.poetry.scripts]
-devtest = { reference = "mypackage:test.run_tests", extras = ["test"], type = "console" }
-```
-
 {{% note %}}
 When a script is added or updated, run `poetry install` to make them available in the project's virtualenv.
 {{% /note %}}