Hello Biopython maintainers,

I noticed that the PDF link in the Biopython Tutorial and Cookbook documentation is currently broken:

Current broken link:
https://biopython.org/DIST/docs/tutorial/Tutorial.pdf

Suggested fix:
Please update or provide a working link to the PDF version of the tutorial, or update the documentation to point to the correct resource.

Thank you for maintaining this valuable resource for the community!