Update error-handler.mdx (#14434)

In Multiple Error Handlers section, update the code block snippet.
Replace Sentry.ErrorHandler with Sentry.SentryErrorHandler.

Author: abecirovic3

docs/platforms/javascript/guides/angular/features/error-handler.mdx

@@ -67,7 +67,7 @@ Therefore, if you're using your own error handler or you want to add additional
 ```typescript
 import * as Sentry from "@sentry/angular";
 
-export class CustomErrorHandler extends Sentry.ErrorHandler {
+export class CustomErrorHandler extends Sentry.SentryErrorHandler {
   constructor() {
     // Pass options to Sentry's ErrorHandler here. For Example:
     super({ logErrors: false });