gh-36066: Fix link to tutorial in PDF docs. This fixes #35736.
Fix link to PDF tutorial (English) in docs. This should fix #35736.
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The document name for the English tutorial is broken: it doesn't match
the name expected in the index.html file for the documentation. So we
change the document name.
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### :hourglass: Dependencies
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URL: https://github.com/sagemath/sage/pull/36066
Reported by: John H. Palmieri
Reviewer(s): Kwankyu Lee
