Documentation cleanup: escape "::" to avoid a Doxygen warning

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158778 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGCXXABI.h b/lib/CodeGen/CGCXXABI.h
index 3f2ed86..33f9743 100644
--- a/lib/CodeGen/CGCXXABI.h
+++ b/lib/CodeGen/CGCXXABI.h
@@ -201,7 +201,7 @@
   ///
   /// Several cases are filtered out before this method is called:
   ///   - non-array allocations never need a cookie
-  ///   - calls to ::operator new(size_t, void*) never need a cookie
+  ///   - calls to \::operator new(size_t, void*) never need a cookie
   ///
   /// \param ElementType - the allocated type of the expression,
   ///   i.e. the pointee type of the expression result type