fix: minor typo on the Schedule page

[kanishk16]

fixes a minor typo on the Schedule Page

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(Image: CC-BY license, The Turing Way Community, & Scriberia. Zenodo. http://doi.org/10.5281/zenodo.3332808)
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[Remi-Gau]

thanks

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(Image: CC-BY license, The Turing Way Community, & Scriberia. Zenodo. http://doi.org/10.5281/zenodo.3332808)
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