Fix link to repository

Author: twoscomplement

cxx-abi-dev/index.html

@@ -16,7 +16,7 @@ <h1>cxx-abi-dev Archives</h1>
 "cxx-abi-dev", as well as several offline meetings.  That mailing
 list is now defunct, and discussion and development now happens 
 on our
-<a href="https://https://github.com/itanium-cxx-abi/cxx-abi/issues">
+<a href="https://github.com/itanium-cxx-abi/cxx-abi/issues">
 GitHub repository</a>.  However, the old discussions are still
 valuable as a source of historical information about the ABI,
 which can illuminate the intent of both the document and its