message: add note about omitting the rules property
diff: @@ -28,7 +28,21 @@ const expression = {
  // single parameter rules take a single value.
  regex: /.(js|ts)$/,
  // multiple paramter rules take a single array.
  - in: [1, 2, 3] }, scope: 'myscope', arg: 'from.email'
  + in: [1, 2, 3]
  + },
  + scope: 'myscope', // optional
  + arg: 'from.email' // optional
  +};
  +
  +// You can omit the omit nesting the rules in a property if you don't
  +// need to provide other options.
  +const expression = {
  + // parameterless rules take a boolean value.
  + required: true,
  + // single parameter rules take a single value.
  + regex: /.(js|ts)$/,
  + // multiple paramter rules take a single array.
  + in: [1, 2, 3]
  };
  ```
  