DOC: use notebook-style for plot_svm_regression.py example

[jayasuryajsk]

Fixed the html rendering issue on the website for this example as per the instructions given.

Part of #22406

[lesteve]

Can you make the comments into titles by using --- (of the right length)? I made a suggestion for the first one if you can handle the others in a similar way this would be great!

[lesteve]

Suggested change

	# Generate sample data
	# Generate sample data
	# --------------------

[jayasuryajsk]

No worries. Done.

[lesteve]

I reopened this PR and pushed some tweaks.

Pieces of advice:

• once you open a PR you can push commits into the branch, you don't need to open a new PR as you did in Fixed the html rendering issue on the website along with headings #22543
• a good practice is to create a branch other than main to open a pull request

[jayasuryajsk]

I reopened this PR and pushed some tweaks.

Pieces of advice:

• once you open a PR you can push commits into the branch, you don't need to open a new PR as you did in Fixed the html rendering issue on the website along with headings #22543
• a good practice is to create a branch other than main to open a pull request

Thank you so much for the advice. I'm new to open source contribution and this is my first project. I'll keep these things in mind for next time.

[lesteve]

Merging, thanks a lot!