[docs] Fix formatting.

'\n' was displaying as 'n'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184507 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/CommandGuide/FileCheck.rst b/docs/CommandGuide/FileCheck.rst
index 0d98349..809eee0 100644
--- a/docs/CommandGuide/FileCheck.rst
+++ b/docs/CommandGuide/FileCheck.rst
@@ -44,7 +44,7 @@
  By default, FileCheck canonicalizes input horizontal whitespace (spaces and
  tabs) which causes it to ignore these differences (a space will match a tab).
  The :option:`--strict-whitespace` argument disables this behavior. End-of-line
- sequences are canonicalized to UNIX-style '\n' in all modes.
+ sequences are canonicalized to UNIX-style ``\n`` in all modes.
 
 .. option:: -version