message: docs(aio): correct some minor typos in the form validation cookbook
diff: @@ -530,7 +530,7 @@ The optional second value is a validator function or an array of validator funct
  Most of the validator functions are stock validators provided by Angular as static methods of the `Validators` class.
  Angular has stock validators that correspond to the standard HTML validation attributes.
  -The `forbiddenNames` validator on the `"name"` control is a custom validator,
  +The `forbiddenName` validator on the `"name"` control is a custom validator,
  discussed in a separate [section below](guide/form-validation#custom-validation).
  @@ -626,11 +626,11 @@ and to compare all of the files in this cookbook sample.
  ## Custom validation
  -This cookbook sample has a custom `forbiddenNamevalidator()` function that's applied to both the
  +This cookbook sample has a custom `forbiddenNameValidator()` function that's applied to both the
  template-driven and the reactive form controls. It's in the `src/app/shared` folder
  and declared in the `SharedModule`.
  -Here's the `forbiddenNamevalidator()` function:
  +Here's the `forbiddenNameValidator()` function:
  <code-example path="cb-form-validation/src/app/shared/forbidden-name.directive.ts" region="custom-validator" title="shared/forbidden-name.directive.ts (forbiddenNameValidator)" linenums="false">
  