docs ts/latest/guide/attribute-directives fix typo

[DumpOfTheVar]

Change Import to Input which is used in the example

import { Directive, ElementRef, HostListener, Input } from '@angular/core';

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[wardbell]

Thanks. Sign the CLA and I'll accept this. If you disappear, I'll have to do under a different PR

[DumpOfTheVar]

@wardbell done

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