CommandLine.rst: remove tiny bit of bad mark-up

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186042 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CommandLine.rst b/docs/CommandLine.rst
index 6535551..4c84d23 100644
--- a/docs/CommandLine.rst
+++ b/docs/CommandLine.rst
@@ -925,7 +925,7 @@
 
   .. code-block:: c++
 
-    cl::opt<**bool**> Quiet("quiet");
+    cl::opt<bool> Quiet("quiet");
 
 .. _cl::desc(...):