style(docs-infra): fix docs examples for tslint rule semicolon (#38143)

This commit updates the docs examples to be compatible with the
`semicolon` tslint rule.

This is in preparation of updating the docs examples `tslint.json` to
match the one generated for new Angular CLI apps in a future commit.

PR Close #38143

aio/content/examples/dependency-injection/src/app/providers.component.ts

@@ -107,7 +107,7 @@ export class OldLogger {
   logs: string[] = [];
   log(message: string) {
     throw new Error('Should not call the old logger!');
-  };
+  }
 }
 
 @Component({