Actually fix rendering of the example code block!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175113 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LanguageExtensions.rst b/docs/LanguageExtensions.rst
index dd54cff..014e264 100644
--- a/docs/LanguageExtensions.rst
+++ b/docs/LanguageExtensions.rst
@@ -1957,7 +1957,7 @@
 
    Another example:
 
-   .. code-block: c
+   .. code-block:: c
 
      __attribute__((__format__ (__printf__, 1, 3)))
      void foo(const char* s, char *buf, ...) {