Fix incorrect column slicing in notebook-covidspread.ipynb

[Copilot]

After groupby('Country/Region').sum(), each row retains three non-date columns — Province/State, Lat, Long — before date columns begin. The original [2:] slice skipped only Lat/Long, causing Province/State to appear in plots and errors in downstream mkframe calls.

Changes

• Slicing: [2:] → [3:] in the US plotting cells to skip all three non-date metadata columns
• Drop columns: Added Province/State to drop(columns=[...]) on infected, recovered, deaths
• Note text: Updated to accurately describe three columns being removed and reference the correct slice index
• Output cell: Regenerated plot output to reflect corrected slicing

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• Quiz (add a file in the quiz-app with all localizations)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Issue</issue_title>
<issue_description>Look at #724 and create a new PR Implementing the changes required </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Issue #743

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