Don't currently have a PDF of the tutorial

See #213

Author: peterjc

wiki/Seq.md

@@ -13,8 +13,7 @@ This page describes the Biopython `Seq` object, defined in the `Bio.Seq`
 module (together with related objects like the `MutableSeq`, plus some
 general purpose sequence functions). In addition to this wiki page,
 there is a whole chapter in the
-[Tutorial](http://biopython.org/DIST/docs/tutorial/Tutorial.html)
-([PDF](http://biopython.org/DIST/docs/tutorial/Tutorial.pdf)) on the
+[Tutorial](http://biopython.org/DIST/docs/tutorial/Tutorial.html) on the
 `Seq` object - plus its [API
 documentation](http://biopython.org/DIST/docs/api/Bio.Seq.Seq-class.html)
 (which you can read online, or from within Python with the help