docs(material/cdk/observers): Documentation supplement due to extended capabilities of the directive

[dananaprey]

When using the cdkObserveContent directive, I noticed that it reacts to changes in any content within the element it applies to, not just ng-content, or is this a coincidence?

If this is intended, I suggest improving the documentation so that this feature does not seem like a coincidence.
https://material.angular.dev/cdk/observers/overview

The suggested changes to the code could be edited better to convey the information more simply

Example:

<div class="content-wrapper" (click)="changeText()" (cdkObserveContent)="textChanged()">
  {{ text }}
</div>

text = 'text1';

textChanged() {
  console.log(this.text);
}

changeText() {
  this.text = 'text2';
}

When I click on the div in the console I see a message:

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[dananaprey]

@adolgachev @wagnermaciel сould you please consider my proposal?

[dananaprey]

@crisbeto сould you please consider my proposal?

[wagnermaciel]

LGTM

[dananaprey]

LGTM

Thank you!

[dananaprey]

@crisbeto can you consider my proposal, please?)

[mmalerba]

The changes were merged into the following branches: main, 20.1.x

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