[docs] Fix hyperlink

[andre]

Summary

Hyperlink was broken

[lhames]

LGTM. Thanks André.

Do you have commit access? If not I can commit on your behalf. Just let me know what email address to use in the attribution.

[andre]

I don't have commit access. My email is [e-mail] Thanks in advance for committing on my behalf

[lhames]

This one fell through the cracks -- my apologies. Luckily Jinsong Ji committed the same fix in 557a17eec06a5.

llvm/docs/tutorial/index.rst

.. toctree::
    :glob:
    :numbered:
 
    BuildingAJIT*
 
 External Tutorials
 ==================
 
-`Tutorial: Creating an LLVM Backend for the Cpu0 Architecture <http://jonathan2251.github.com/lbd/>`_
+`Tutorial: Creating an LLVM Backend for the Cpu0 Architecture <https://jonathan2251.github.io/lbd/>`_
    A step-by-step tutorial for developing an LLVM backend. Under
    active development at `<https://github.com/Jonathan2251/lbd>`_ (please
    contribute!).
 
 `Howto: Implementing LLVM Integrated Assembler`_
    A simple guide for how to implement an LLVM integrated assembler for an
    architecture.
 
 .. _`Howto: Implementing LLVM Integrated Assembler`: http://www.embecosm.com/appnotes/ean10/ean10-howto-llvmas-1.0.html
 
 Advanced Topics
 ===============
 
 #. `Writing an Optimization for LLVM <https://llvm.org/pubs/2004-09-22-LCPCLLVMTutorial.html>`_