Put space after "code-block::".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158880 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CodingStandards.rst b/docs/CodingStandards.rst
index e7e5f23..a416a1e 100644
--- a/docs/CodingStandards.rst
+++ b/docs/CodingStandards.rst
@@ -680,7 +680,7 @@
 
 Here are some examples of good and bad names:
 
-.. code-block::c++
+.. code-block:: c++
 
   class VehicleMaker {
     ...