Fix typo in declaring code-block snippet

llvm-svn: 332630
diff --git a/llvm/docs/CommandGuide/llvm-mca.rst b/llvm/docs/CommandGuide/llvm-mca.rst
index e3e87a6..b921f35 100644
--- a/llvm/docs/CommandGuide/llvm-mca.rst
+++ b/llvm/docs/CommandGuide/llvm-mca.rst
@@ -65,7 +65,7 @@
 
 Or for Intel syntax:
 
-... code-block:: bash
+.. code-block:: bash
 
   $ clang foo.c -O2 -target x86_64-unknown-unknown -mllvm -x86-asm-syntax=intel -S -o - | llvm-mca -mcpu=btver2