Another attempt to fix the sphinx warning from r299470

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@299488 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 30febd14fd42b7be401a4b0fc0df037fc6893b59)
diff --git a/docs/LanguageExtensions.rst b/docs/LanguageExtensions.rst
index 644fba3..8ec370c 100644
--- a/docs/LanguageExtensions.rst
+++ b/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.