docs(input): ngPattern validates against view value

[melbourne2991]

ngPattern doesn't validate modelValue any more, it validates the viewValue. (https://github.com/angular/angular.js/pull/12640/files#diff-fd9d2cc2d19609321aa0bd5cfa6b3444R46).

I think it's worth mentioning explicitly, reading "ngModel value", I assumed it was referring to the modelValue.

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[melbourne2991]

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#13376 (comment).

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[Narretz]

Thanks for the heads-up! This was wrong in a few other places, so I fixed it with another commit.