[5105] kea6 example corrected

doc/examples/kea6/multiple-options.json

@@ -58,7 +58,7 @@
             // that does not allow "\,". Therefore the slightly uncommon double
             // backslashes natation is needed.
             "name": "new-posix-timezone",
-            "data": "EST5EDT4\,M3.2.0/02:00\,M11.1.0/02:00"
+            "data": "EST5EDT4\\,M3.2.0/02:00\\,M11.1.0/02:00"
         }
       ],
       "pools": [