RHDHBUGS-2956: Remove stale link and update reference in documentation (#2053)

* Replace stale link

* Replace stale link

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Co-authored-by: GitHub Actions <github-actions@github.com>
Co-authored-by: Fabrice Flore-Thébault <ffloreth@redhat.com>
Co-authored-by: Nick Boldt <nboldt@redhat.com>

Author: 4 people

modules/shared/proc-enable-plugins-added-in-the-rhdh-container-image.adoc

@@ -9,7 +9,7 @@ The {product-very-short} container image preinstalls a set of dynamic plugins to
 You can enable and configure the plugins in the {product-very-short} container image. This includes how to manage the default configuration, set necessary environment variables, and ensure the proper functionality of the plugins within your application.
 
 .Prerequisites
-* You have access to the link:https://github.com/redhat-developer/rhdh/blob/main/dynamic-plugins.default.yaml[`dynamic-plugins.default.yaml`] file, which lists all preinstalled plugins and their default configuration.
+* You have access to the link:https://raw.githubusercontent.com/redhat-developer/rhdh/refs/heads/release-1.9/dynamic-plugins.default.yaml[`dynamic-plugins.default.yaml`] file, which lists all preinstalled plugins and their default configuration.
 * You have deployed the {product-very-short} application, and have access to the logs of the `install-dynamic-plugins` init container.
 * You have the necessary permissions to change plugin configurations and access the application environment.
 * You have identified and set the required environment variables referenced by the plugin's default configuration. You must define these environment variables in the Helm Chart or Operator configuration.