chore: Improve deprecation warning in v25.3 changelog about switching to frontend unpriv image

changelog/seqera-enterprise/v25.3.md

@@ -129,7 +129,12 @@ See the [MultiQC changelog](https://docs.seqera.io/changelog/tags/multiqc) for d
 
 ## General warnings
 
-Starting from version 26.1, the front end image running as root user will be deprecated. We recommend starting to switch to the root-less image (also known as "unprivileged" image) during this upgrade. See [Kubernetes](https://docs.seqera.io/platform-enterprise/enterprise/platform-kubernetes#seqera-frontend-unprivileged) and [docker-compose](https://docs.seqera.io/platform-enterprise/enterprise/platform-docker-compose#seqera-frontend-unprivileged) deployment documentation for instructions.
+Starting in version 26.1, the root user image is deprecated. We recommend switching to the unprivileged (rootless) image during this upgrade. To do so:
+
+- Update the image tag.
+- Modify your Kubernetes Service resource or Docker Compose service definition to forward requests to port `8000` (the default for the unprivileged image).
+
+See [Kubernetes](https://docs.seqera.io/platform-enterprise/enterprise/platform-kubernetes#seqera-frontend-unprivileged) and [docker-compose](https://docs.seqera.io/platform-enterprise/enterprise/platform-docker-compose#seqera-frontend-unprivileged) deployment documentation for instructions.
 
 ## Upgrade steps