Fix example in help of format function

resources/function_help/json/format

@@ -8,6 +8,6 @@
                  {"arg":"arg1", "syntaxOnly": true},
                  {"arg":"arg2", "syntaxOnly": true},
                  {"arg":"arg", "descOnly": true, "description":"any type. Any number of arguments."}],
-  "examples": [ { "expression":"format('This %1 a %2','is', 'test')", "returns":"'This is a test''"}
+  "examples": [ { "expression":"format('This %1 a %2','is', 'test')", "returns":"'This is a test'"}
   ]
 }