content: ion-alert, how to handle data or events from inputs is poorly documented

### Describe the Bug

I try to handle alert input value but I cannot catch the handler ever

```
async presentAlert(isResidentOwner: boolean) {
const alert = await this.alertController.create({
buttons: [
{
text: 'Cancel',
role: 'cancel',
cssClass: 'danger',
handler: () => {
if (isResidentOwner) {
this.ownerAmountPayment = false;
} else {
this.rentAmountPayment = false;
}
},
},
{
text: 'Proceed',
handler: (alertData) => {
this.confirm(alertData.amount);
},
},
],
inputs: [
{
id: 'modal_amount',
name: 'modal_amount',
placeholder: 'Amount',
max: 15,
handler: () => {
console.log('Val Change'); // doesn't work
}
},
],
});

await alert.present();
}
```

### Expected Behavior

Throw console log

### Steps to Reproduce

You can try code with https://ionicframework.com/docs/api/alert

### Screenshots

### Operating System

MacOs

### Browser

Chrome(Brave)

### Version

Version 1.48.164 Chromium: 110.0.5481.100 (Official Build) (arm64)

### Additional Information

Ionic:

Ionic CLI : 6.20.1
Ionic Framework : @ionic/angular 6.5.2
@angular-devkit/build-angular : 13.3.10
@angular-devkit/schematics : 13.2.6
@angular/cli : 13.2.6
@ionic/angular-toolkit : 6.1.0

Capacitor:

Capacitor CLI : 4.6.1
@capacitor/android : 4.6.1
@capacitor/core : 4.6.1

Utility:

cordova-res : 0.15.4
native-run : 1.6.0

System:

NodeJS : v18.14.2
npm : 9.5.1
OS : macOS

Start with the ion-alert API documentation and its linked example, reproducing the reported input and button-handler behavior. Update the documentation to clearly explain how to receive input data and handle input or alert events, then verify the example shows the expected value handling.

Written by the indexing model from the issue text.