[PHP-WEBMASTER] [web-php] PR #1138: releases/8.4: Make minor codestyle changes to aviz example

[TimWolla]

Pull Request: https://github.com/php/web-php/pull/1138
Author: TimWolla

This is a small follow-up to php/web-php#1135. It syncs the interpolation 
syntax with the PDO subclasses example by using the “brace-style” interpolation.

/cc @theodorejb