[docs] Fix checkers.rst doc for PointerSorting checker

llvm-svn: 355726
diff --git a/clang/docs/analyzer/checkers.rst b/clang/docs/analyzer/checkers.rst
index b4d53c5..8aabb77 100644
--- a/clang/docs/analyzer/checkers.rst
+++ b/clang/docs/analyzer/checkers.rst
@@ -1944,7 +1944,7 @@
  }
 
 alpha.nondeterminism.PointerSorting (C++)
-"""""""""""""""""""""""""
+"""""""""""""""""""""""""""""""""""""""""
 Check for non-determinism caused by sorting of pointers.
 
 .. code-block:: c