Merge pull request #1692 from reaperhulk/ibm-has-the-worst-webserver

remove IBM link and replace with smartbear PDF link

docs/development/submitting-patches.rst

@@ -151,6 +151,6 @@ So, specifically:
 
 .. _`Write comments as complete sentences.`: http://nedbatchelder.com/blog/201401/comments_should_be_sentences.html
 .. _`syntax`: http://sphinx-doc.org/domains.html#info-field-lists
-.. _`Studies have shown`: http://www.ibm.com/developerworks/rational/library/11-proven-practices-for-peer-review/
+.. _`Studies have shown`: https://smartbear.com/smartbear/media/pdfs/wp-cc-11-best-practices-of-peer-code-review.pdf
 .. _`our mailing list`: https://mail.python.org/mailman/listinfo/cryptography-dev
 .. _`doc8`: https://github.com/stackforge/doc8