docs(alert): fix type errors

Author: brandyscarney

static/usage/v7/alert/buttons/angular/example_component_ts.md

@@ -1,6 +1,7 @@
 ```ts
 import { Component } from '@angular/core';
 import { IonAlert, IonButton } from '@ionic/angular/standalone';
+import type { OverlayEventDetail } from '@ionic/core';
 
 @Component({
   selector: 'app-example',
@@ -25,7 +26,8 @@ export class ExampleComponent {
     },
   ];
 
-  setResult(ev) {
+  setResult(event: Event) {
+    const ev = event as CustomEvent<OverlayEventDetail<string>>;
     console.log(`Dismissed with role: ${ev.detail.role}`);
   }
 }

static/usage/v8/alert/buttons/angular/example_component_ts.md

@@ -1,6 +1,7 @@
 ```ts
 import { Component } from '@angular/core';
 import { IonAlert, IonButton } from '@ionic/angular/standalone';
+import type { OverlayEventDetail } from '@ionic/core';
 
 @Component({
   selector: 'app-example',
@@ -25,7 +26,8 @@ export class ExampleComponent {
     },
   ];
 
-  setResult(ev) {
+  setResult(event: Event) {
+    const ev = event as CustomEvent<OverlayEventDetail<string>>;
     console.log(`Dismissed with role: ${ev.detail.role}`);
   }
 }