message: docs(forms): update description for FormBuilder.group
  PR Close
diff: @@ -32,7 +32,16 @@ export class FormBuilder {
  * @param controlsConfig A collection of child controls. The key for each child is the name
  * under which it is registered.
  *
  - * @param extra An object of configuration options for the `FormGroup`.
  + * @param legacyOrOpts Configuration options object for the `FormGroup`. The object can
  + * have two shapes:
  + *
  + * 1) `AbstractControlOptions` object (preferred), which consists of:
  + * * `validators`: A synchronous validator function, or an array of validator functions
  + * * `asyncValidators`: A single async validator or array of async validator functions
  + * * `updateOn`: The event upon which the control should be updated (options: 'change' | 'blur' |
  + * submit')
  + *
  + * 2) Legacy configuration object, which consists of:
  * * `validator`: A synchronous validator function, or an array of validator functions
  * * `asyncValidator`: A single async validator or array of async validator functions
  *
  