docs: fixup legacy HTML link

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169308 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/userguides.rst b/docs/userguides.rst
index 8f18420..dd87055 100644
--- a/docs/userguides.rst
+++ b/docs/userguides.rst
@@ -37,8 +37,7 @@
 
    Notes on building and testing LLVM/Clang on ARM.
 
-* `Getting Started with the LLVM System using Microsoft Visual Studio
-  <GettingStartedVS.html>`_
+* :doc:`GettingStartedVS`
 
    An addendum to the main Getting Started guide for those using Visual Studio
    on Windows.