Fix documentation snafu that recommended invalid settings (#9018)

docs/configuration.md

@@ -301,21 +301,20 @@ For example, `ruff check /path/to/excluded/file.py` will always lint `file.py`.
 
 ### Default inclusions
 
-By default, Ruff will discover files matching `*.py`, `*.ipy`, or `pyproject.toml`. 
+By default, Ruff will discover files matching `*.py`, `*.ipy`, or `pyproject.toml`.
 
 To lint or format files with additional file extensions, use the [`extend-include`](settings.md#extend-include) setting.
 
 === "pyproject.toml"
 
     ```toml
-    [tool.ruff.lint]
+    [tool.ruff]
     extend-include = ["*.ipynb"]
     ```
 
 === "ruff.toml"
 
     ```toml
-    [lint]
     extend-include = ["*.ipynb"]
     ```
 
@@ -325,14 +324,13 @@ You can also change the default selection using the [`include`](settings.md#incl
 === "pyproject.toml"
 
     ```toml
-    [tool.ruff.lint]
+    [tool.ruff]
     include = ["pyproject.toml", "src/**/*.py", "scripts/**/*.py"]
     ```
 
 === "ruff.toml"
 
     ```toml
-    [lint]
     include = ["pyproject.toml", "src/**/*.py", "scripts/**/*.py"]
     ```