message: Update configuration docs about
  * Update configuration docs about
  The docblock is a feature that's coming in Jest version 20.0.0.
  This commit adds this information to the documentation.
  * Fix formatting in docs
diff: @@ -365,7 +365,10 @@ To make a dependency explicit instead of implicit, you can call [`expect.addSnap
  ### `testEnvironment` [string]
  Default: `"jsdom"`
  -The test environment that will be used for testing. The default environment in Jest is a browser-like environment through [jsdom](https://github.com/tmpvar/jsdom). If you are building a node service, you can use the `node` option to use a node-like environment instead. If some tests require another environment, you can add a `@jest-environment` docblock.
  +The test environment that will be used for testing. The default environment in Jest is a browser-like environment through [jsdom](https://github.com/tmpvar/jsdom). If you are building a node service, you can use the `node` option to use a node-like environment instead.
  +
  +If some tests require another environment, you can add a `@jest-environment` docblock.
  +##### available in Jest **19.0.0+**
  ```js
  /**
  