[ORC][docs] Fix an RST error: the code-block directive needs a newline after it.

llvm-svn: 366270
diff --git a/llvm/docs/ORCv2.rst b/llvm/docs/ORCv2.rst
index 2f37a2f..7423c04 100644
--- a/llvm/docs/ORCv2.rst
+++ b/llvm/docs/ORCv2.rst
@@ -452,6 +452,7 @@
 std::unique_ptr<LLVMContext>:
 
   .. code-block:: c++
+
     ThreadSafeContext TSCtx(llvm::make_unique<LLVMContext>());
 
 ThreadSafeModules can be constructed from a pair of a std::unique_ptr<Module>