Escaping an RST character to correct a Sphinx warning.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213651 91177308-0d34-0410-b5e6-96231b3b80d8

docs/ClangFormatStyleOptions.rst

@@ -213,7 +213,7 @@ the configuration (without a prefix: ``Auto``).
 
 **DerivePointerAlignment** (``bool``)
   If ``true``, analyze the formatted file for the most common
-  alignment of & and *. ``PointerAlignment`` is then used only as fallback.
+  alignment of & and \*. ``PointerAlignment`` is then used only as fallback.
 
 **DisableFormat** (``bool``)
   Disables formatting at all.