message: docs: fix typo in user input guide
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diff: @@ -69,7 +69,7 @@ DOM event object in the `$event` variable which this code passes as a parameter
  The properties of an `$event` object vary depending on the type of DOM event. For example,
  -a mouse event includes different information than a input box editing event.
  +a mouse event includes different information than an input box editing event.
  All [standard DOM event objects](https://developer.mozilla.org/en-US/docs/Web/API/Event)
  have a `target` property, a reference to the element that raised the event.
  