DOC use notebook-style for plot_sparse_cov.py (#22807)
DOC use notebook-style for plot_sparse_cov.py (#22807)

Co-authored-by: Jérémie du Boisberranger <e3f2e912120bf2b3b91d0d3b53109753fb66c284@users.noreply.github.com>
Co-authored-by: Loïc Estève <b4f57ceb208f2c5eae4e1192d707c3466a564837@ymail.com>
AlexandreAbraham/scikit-learn,scikit-learn/scikit-learn,AlexandreAbraham/scikit-learn,vinayak-mehta/scikit-learn,jakirkham/scikit-learn,espg/scikit-learn,ivannz/scikit-learn,saiwing-yeung/scikit-learn,lesteve/scikit-learn,AlexandreAbraham/scikit-learn,jakirkham/scikit-learn,anntzer/scikit-learn,TomDLT/scikit-learn,espg/scikit-learn,anntzer/scikit-learn,anntzer/scikit-learn,anntzer/scikit-learn,manhhomienbienthuy/scikit-learn,scikit-learn/scikit-learn,espg/scikit-learn,ivannz/scikit-learn,lesteve/scikit-learn,TomDLT/scikit-learn,manhhomienbienthuy/scikit-learn,TomDLT/scikit-learn,manhhomienbienthuy/scikit-learn,jakirkham/scikit-learn,ivannz/scikit-learn,ivannz/scikit-learn,espg/scikit-learn,scikit-learn/scikit-learn,saiwing-yeung/scikit-learn,AlexandreAbraham/scikit-learn,betatim/scikit-learn,betatim/scikit-learn,vinayak-mehta/scikit-learn,lesteve/scikit-learn,saiwing-yeung/scikit-learn,TomDLT/scikit-learn,vinayak-mehta/scikit-learn,betatim/scikit-learn,jakirkham/scikit-learn,scikit-learn/scikit-learn,lesteve/scikit-learn,manhhomienbienthuy/scikit-learn,vinayak-mehta/scikit-learn,saiwing-yeung/scikit-learn,betatim/scikit-learn