message: docs: add note to clarify that ngOnChanges is only called if inputs are bound
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diff: @@ -60,7 +60,7 @@ Angular executes hook methods in the following sequence. You can use them to per
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  - Called before `ngOnInit()` and whenever one or more data-bound input properties change.
  + Called before `ngOnInit()` (if the component has bound inputs) and whenever one or more data-bound input properties change.
  Note that if your component has no inputs or you use it without providing any inputs, the framework will not call `ngOnChanges()`.
  @@ -79,7 +79,7 @@ Angular executes hook methods in the following sequence. You can use them to per
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  - Called once, after the first `ngOnChanges()`.
  + Called once, after the first `ngOnChanges()`. `ngOnInit()` is still called even when `ngOnChanges()` is not (which is the case when there are no template-bound inputs).
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