Update slides

Author: stefmolin

slides/html/workshop.slides.html

@@ -13027,7 +13027,7 @@ <h2 id="Reshaping-data">Reshaping data<a class="anchor-link" href="#Reshaping-da
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-<p>Now, we can work on reshaping it into two columns the date and the traveler throughput from 2019 through 2021.</p>
+<p>Now, we can work on reshaping it into two columns: the date and the traveler throughput from 2019 through 2021.</p>
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