Extend SequentialFeatureSelector example to demonstrate how to use negative tol

### Describe the bug

I utilized the **SequentialFeatureSelector** for feature selection in my code, with the direction set to "backward." The tolerance value is negative and the selection process stops when the decrease in the metric, AUC in this case, is less than the specified tolerance. Generally, increasing the number of features results in a higher AUC, but sacrificing some features, especially correlated ones that offer little contribution, can produce a pessimistic model with a lower AUC. The code worked as expected in **sklearn 1.1.1**, but when I updated to **sklearn 1.2.1**, I encountered the following error.

### Steps/Code to Reproduce

```python
from sklearn.datasets import load_breast_cancer
from sklearn.linear_model import LogisticRegression
from sklearn.feature_selection import SequentialFeatureSelector
from sklearn.preprocessing import StandardScaler
from sklearn.pipeline import Pipeline

X, y = load_breast_cancer(return_X_y=True)

TOL = -0.001
feature_selector = SequentialFeatureSelector(
                    LogisticRegression(max_iter=1000),
                    n_features_to_select="auto",
                    direction="backward",
                    scoring="roc_auc",
                    tol=TOL
                )


pipe = Pipeline(
    [('scaler', StandardScaler()), 
    ('feature_selector', feature_selector), 
    ('log_reg', LogisticRegression(max_iter=1000))]
    )



if __name__ == "__main__":
    pipe.fit(X, y)
    print(pipe['log_reg'].coef_[0])

```

### Expected Results

```
$ python sfs_tol.py 
[-2.0429818   0.5364346  -1.35765488 -2.85009904 -2.84603016]
```

### Actual Results

```python-traceback
$ python sfs_tol.py 
Traceback (most recent call last):
  File "/home/modelling/users-workspace/nsofinij/lab/open-source/sfs_tol.py", line 28, in <module>
    pipe.fit(X, y)
  File "/home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/sklearn/pipeline.py", line 401, in fit
    Xt = self._fit(X, y, **fit_params_steps)
  File "/home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/sklearn/pipeline.py", line 359, in _fit
    X, fitted_transformer = fit_transform_one_cached(
  File "/home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/joblib/memory.py", line 349, in __call__
    return self.func(*args, **kwargs)
  File "/home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/sklearn/pipeline.py", line 893, in _fit_transform_one
    res = transformer.fit_transform(X, y, **fit_params)
  File "/home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/sklearn/utils/_set_output.py", line 142, in wrapped
    data_to_wrap = f(self, X, *args, **kwargs)
  File "/home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/sklearn/base.py", line 862, in fit_transform
    return self.fit(X, y, **fit_params).transform(X)
  File "/home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/sklearn/feature_selection/_sequential.py", line 201, in fit
    self._validate_params()
  File "/home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/sklearn/base.py", line 581, in _validate_params
    validate_parameter_constraints(
  File "/home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/sklearn/utils/_param_validation.py", line 97, in validate_parameter_constraints
    raise InvalidParameterError(
sklearn.utils._param_validation.InvalidParameterError: The 'tol' parameter of SequentialFeatureSelector must be None or a float in the range (0, inf). Got -0.001 instead.

```

### Versions

```shell
System:
    python: 3.10.8 | packaged by conda-forge | (main, Nov 22 2022, 08:26:04) [GCC 10.4.0]
executable: /home/modelling/opt/anaconda3/envs/py310/bin/python
   machine: Linux-4.14.301-224.520.amzn2.x86_64-x86_64-with-glibc2.26

Python dependencies:
      sklearn: 1.2.1
          pip: 23.0
   setuptools: 66.1.1
        numpy: 1.24.1
        scipy: 1.10.0
       Cython: None
       pandas: 1.5.3
   matplotlib: 3.6.3
       joblib: 1.2.0
threadpoolctl: 3.1.0

Built with OpenMP: True

threadpoolctl info:
       user_api: openmp
   internal_api: openmp
         prefix: libgomp
       filepath: /home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/scikit_learn.libs/libgomp-a34b3233.so.1.0.0
        version: None
    num_threads: 64

       user_api: blas
   internal_api: openblas
         prefix: libopenblas
       filepath: /home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/numpy.libs/libopenblas64_p-r0-15028c96.3.21.so
        version: 0.3.21
threading_layer: pthreads
   architecture: SkylakeX
    num_threads: 64

       user_api: blas
   internal_api: openblas
         prefix: libopenblas
       filepath: /home/modelling/opt/anaconda3/envs/py310/lib/python3.10/site-packages/scipy.libs/libopenblasp-r0-41284840.3.18.so
        version: 0.3.18
threading_layer: pthreads
   architecture: SkylakeX
    num_threads: 64
```

COMMENT:
> I think it's fine to keep the existing contents as it is but then append a new section that demonstrate backward selection with a negative tolerance to select a smaller number of features on the Brest cancer dataset.

Hey @ogrisel, I created a [Colab Notebook](https://colab.research.google.com/drive/1vg0Jowr7wzOGcdCESMmfFAVhtTVt7LmJ#scrollTo=j93_bFeLEllL) for feature selection on the breast cancer dataset using `SequentialFeatureSelector`, that makes use of negative values of `tol`. I will work on creating a PR for this based on the code in the notebook.

Labels: Bug, module:feature_extraction