docs: Update the docs to reflect new Azure DevOps Marketplace functio…

…nality (#19738)

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>
Co-authored-by: Jamie Magee <jamie.magee@gmail.com>

lib/modules/datasource/azure-pipelines-tasks/readme.md

@@ -1,2 +1 @@
-This datasource returns versions of the [built-in Azure Pipelines tasks](https://docs.microsoft.com/en-us/azure/devops/pipelines/tasks/?view=azure-devops).
-It does not yet support Azure Pipelines tasks from the [Visual Studio Marketplace](https://marketplace.visualstudio.com/search?target=AzureDevOps&category=Azure%20Pipelines)
+This datasource returns versions of the [built-in Azure Pipelines tasks](https://docs.microsoft.com/en-us/azure/devops/pipelines/tasks/?view=azure-devops) and from all _public_ extensions on the [Visual Studio Marketplace](https://marketplace.visualstudio.com/search?target=AzureDevOps&category=Azure%20Pipelines).