Another attempt to fix the sphinx warning from r299470

llvm-svn: 299488
diff --git a/clang/docs/LanguageExtensions.rst b/clang/docs/LanguageExtensions.rst
index 6427067..29e971c 100644
--- a/clang/docs/LanguageExtensions.rst
+++ b/clang/docs/LanguageExtensions.rst
@@ -2344,4 +2344,4 @@
 
 The pragma can also be used with ``off`` which turns FP contraction off for a
 section of the code. This can be useful when fast contraction is otherwise
-enabled for the translation unit with the ``-ffp-contract=fast` flag.
+enabled for the translation unit with the ``-ffp-contract=fast`` flag.