chore: shorten docs

Author: sweb

deploy/helm/postgresql-trino-gateway/README.md

@@ -61,19 +61,7 @@ admission with `... is not an allowed group` / `must be in the ranges`.
 
 Set `openshift.enabled=true` to omit `runAsUser`, `runAsGroup` and
 `fsGroup` from the pod and container security contexts, letting the SCC
-inject them:
-
-```bash
-helm install gw ./deploy/helm/postgresql-trino-gateway \
-    --set trino.host=trino.example.com \
-    --set openshift.enabled=true
-```
-
-The image is built for this: `/stackable` is group-`0`-owned with `g=u`
-permissions and the chart sets `readOnlyRootFilesystem: true`, so the
-container runs correctly as an arbitrary assigned UID with GID `0`. All
-other hardening (`runAsNonRoot`, `seccompProfile`, dropped capabilities)
-is retained.
+inject them.
 
 ## Connectivity