Attempt to unbreak sphinx build bot by inserting a link.

llvm-svn: 367487
diff --git a/llvm/docs/LoopTerminology.rst b/llvm/docs/LoopTerminology.rst
index 7306167..e901720 100644
--- a/llvm/docs/LoopTerminology.rst
+++ b/llvm/docs/LoopTerminology.rst
@@ -1,3 +1,4 @@
+.. _loop-terminology:
 ===========================================
 LLVM Loop Terminology (and Canonical Forms)
 ===========================================