Set type assertion to the recommended way

[kroeder]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

The doc for User Input uses

this.values += (<HTMLInputElement>event.target).value + ' | ';

Angular CLI generates a tslint that uses tslint:recommended by default and the recommended type assertion value is "no-angle-bracket-type-assertion": true,

Issue Number: N/A

What is the new behavior?

Set

this.values += (<HTMLInputElement>event.target).value + ' | ';

to

this.values += (event.target as HTMLInputElement).value + ' | ';

Does this PR introduce a breaking change?

• Yes
• No

Other information

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[kroeder]

Accidentally copy pasted the wrong commit message. I'll fix that

[googlebot]

CLAs look good, thanks!

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[kroeder]

If you agree with this change I can also scan for more places in the documentation that use the previous syntax and fix those as well. Just let me know! 🙂

[IgorMinar]

thank you for the contribution @kroeder !

[IgorMinar]

merge-assistance: global approval

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