Cross posting articles to mutiple library topics in [#technical-documentation]

Some articles such as How to containerize a PHP application using Docker and LinkORB libraries apply to both the Docker and Symfony library topics.

For an article to appear in multiple libary topics, simply add the secondary topic(s) to a topics array within the article’s frontmatter.

For example, the How to containerize a PHP application using Docker and LinkORB libraries article appears in the Symfony library because symfony was added to its topics array as shown below.

---
layout: "$/layouts/TopicLayout.astro"
title: "How to containerize a PHP application using Docker and LinkORB libraries"
topics: ['symfony']
---

Please note the secondary topic values in the array must be strings and match the topic.name property defined in the given topic’s .yaml file. These values are expected to be lowercase and use hyphens for spaces.