docs: typo fix

[lovelangy]

according to the source code and the doc https://angular.io/api/forms/NgModel#inherited-from-formsngcontrol-1, the method name should be "viewToModelUpdate" instead of "viewToModel"

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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
[x] Documentation content changes
[ ] angular.io application / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

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[lovelangy]

I signed it!

[ashishpatelcs]

I signed it!

Make sure you have signed the CLA.

[lovelangy]

I signed it!

Make sure you have signed the CLA.

thanks,I already signed it.

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CLAs look good, thanks!

[kara]

LGTM

[kara]

@brandonroberts We haven't added forms-overview to pullapprove, so you'll need to approve this from docs team end

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