Fix a docs build break introduced by rL236888.

llvm-svn: 236891
diff --git a/llvm/docs/Statepoints.rst b/llvm/docs/Statepoints.rst
index 438171c..c381c3e 100644
--- a/llvm/docs/Statepoints.rst
+++ b/llvm/docs/Statepoints.rst
@@ -250,7 +250,7 @@
 During lowering, this will result in a instruction selection DAG that looks
 something like:
 
-.. code-block::
+::
 
   CALLSEQ_START
   ...