[python_by_example] Remove the unnecessary text for matplotlib inline

[HengchengZhang]

Hi @jstac and @mmcky, this PR fix #271.

I've tested it in my local environment and it looks well after deleting the text.

[github-actions[bot]]

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[jstac]

Nice work @HengchengZhang , many thanks.

Please fix the failing build or ping @mmcky if you're not sure what's happening.

[mmcky]

@HengchengZhang would you mind to review the links that are reported as broken such as

(        about_py: line   85) broken    https://www.sciencedirect.com/science/article/pii/S1477388021000177 - 403 Client Error: Forbidden for url: https://www.sciencedirect.com/science/article/pii/S1477388021000177

there are a couple of additional ones in the GitHub actions output for the Link Checker

https://github.com/QuantEcon/lecture-python-programming.myst/actions/runs/4663763516/jobs/8255387311?pr=272

[HengchengZhang]

Thanks @jstac and @mmcky, I checked these this afternoon but I think the broken links it gives all work actually.

[mmcky]

Roger that - the false positives are annoying with the link checker. We may need to think about seeing if there are some checks we can skip to reduce the false positivity rate at some point.