Merge pull request #4801 from szkiba/main

xk6 topic: Updated links and description

Author: tomthorogood

topics/xk6/index.md

@@ -1,10 +1,12 @@
 ---
 created_by: Grafana Labs
 display_name: Grafana k6 extension
-github_url: https://github.com/grafana/k6
+github_url: https://github.com/grafana/xk6
 logo: xk6.png
 short_description: Extensions for the Grafana k6.
 topic: xk6
-url: https://k6.io/docs/extensions
+url: https://grafana.com/docs/k6/latest/extensions/
 ---
-With [k6](https://k6.io) extensions, you can create custom [k6](https://k6.io) binaries to support your specific reliability-testing needs.
+[xk6](https://github.com/grafana/xk6) is one of the core components of the [Grafana k6](https://github.com/grafana/k6) performance testing ecosystem. Developers can use the `xk6` command-line tool to customize k6, allowing them to add features, protocols, or output options to meet specific testing needs.
+
+k6 extensions are located in repositories named `xk6-*` and tagged with the `xk6` topic.