message: docs: amend inaccurate immutability definition
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diff: @@ -446,7 +446,7 @@ To learn more, see [Form Validation](guide/form-validation).
  ## immutability
  -The ability to alter the state of a value after its creation. [Reactive forms](#reactive-forms) perform immutable changes in that
  +The inability to alter the state of a value after its creation. [Reactive forms](#reactive-forms) perform immutable changes in that
  each change to the data model produces a new data model rather than modifying the existing one. [Template-driven forms](#template-driven-forms) perform mutable changes with `NgModel` and [two-way data binding](#data-binding) to modify the existing data model in place.
  {@a injectable}
  