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docs: add note about ngModel usage in structural directives guide (#29522) 

When I tried one of the examples provided in the documention, encountered the " Can't bind to 'ngModel' since it isn't a known property of 'select' ” error. So to resolve it I imported the FormsModule in ngModule. If it is mentioned in the documentation, it would be handy for the beginners to try and learn. Thanks for considering.

Duplicate of pull Request# 29206, As I encountered few issues after multiple authors corrected, So I am creating the new pull request

PR Close #29522
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javatutorials2016 2019-03-26 12:01:32 -04:00 committed by Jason Aden
parent a81fd5f750
commit 71daa11357
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aio/content/guide/structural-directives.md
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@ -590,6 +590,11 @@ The drop down works properly.
<img src='generated/images/guide/structural-directives/select-ngcontainer-anim.gif' alt="ngcontainer options work properly">
</figure>
<div class="alert is-helpful">
**Note:** Remember that ngModel directive is defined as a part of Angular FormsModule and you need to include FormsModule in the imports: [...] section of the Angular module metadata, in which you want to use it.
</div>
The `<ng-container>` is a syntax element recognized by the Angular parser.