Fix tsan doc

llvm-svn: 337927
diff --git a/clang/docs/ThreadSanitizer.rst b/clang/docs/ThreadSanitizer.rst
index 4a8db91..d1e2c65 100644
--- a/clang/docs/ThreadSanitizer.rst
+++ b/clang/docs/ThreadSanitizer.rst
@@ -22,6 +22,7 @@
 * Linux
 * NetBSD
 * FreeBSD
+
 Support for other 64-bit architectures is possible, contributions are welcome.
 Support for 32-bit platforms is problematic and is not planned.