docs(forms): fix import line ending

[benbot1]

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
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What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

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[kara]

LGTM

[kara]

@benbot1 Can you sign CLA as described above?

#30290 (comment)

[ngbot]

I see that you just added the PR action: merge label, but the following checks are still failing:
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[benbot1]

@kara I signed it

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CLAs look good, thanks!

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