Fix version (#1438)

Author: paulohtb6

modules/get-started/pages/install-beta.adoc

@@ -2,7 +2,7 @@
 :description: Learn how to install the beta version.
 :publish-only-during-beta: true
 
-Redpanda beta versions provide users the opportunity to test and share feedback on new features before they're finalized in general availability. Beta versions, like `{redpanda-beta-tag}`, are published to `redpanda-unstable` as release candidate (RC) builds. RC builds are not recommended for production use.
+Redpanda beta versions provide users the opportunity to test and share feedback on new features before they're finalized in general availability. Beta versions, like `v{full-version}`, are published to `redpanda-unstable` as release candidate (RC) builds. RC builds are not recommended for production use.
 
 To install the beta version, select your environment.
 
@@ -16,7 +16,7 @@ Docker::
 +
 [source,bash,subs="attributes+"]
 ----
-docker pull docker.redpanda.com/redpandadata/redpanda-unstable:{redpanda-beta-tag}
+docker pull docker.redpanda.com/redpandadata/redpanda-unstable:v{full-version}
 ----
 
 . Create a Docker Compose file with the beta version:
@@ -59,7 +59,7 @@ services:
       - --mode dev-container
       # enable logs for debugging.
       - --default-log-level=debug
-    image: docker.redpanda.com/redpandadata/redpanda-unstable:{redpanda-beta-tag}
+    image: docker.redpanda.com/redpandadata/redpanda-unstable:v{full-version}
     container_name: redpanda-0
     volumes:
       - redpanda-0:/var/lib/redpanda/data
@@ -161,7 +161,7 @@ helm repo update
 helm install cert-manager jetstack/cert-manager --set crds.enabled=true --namespace cert-manager --create-namespace
 helm install redpanda redpanda/redpanda \
   --namespace <namespace> \
-  --create-namespace --set image.repository=docker.redpanda.com/redpandadata/redpanda-unstable --set image.tag={redpanda-beta-tag} --set console.enabled=false
+  --create-namespace --set image.repository=docker.redpanda.com/redpandadata/redpanda-unstable --set image.tag=v{full-version} --set console.enabled=false
 ----
 
 . Generate and deploy the manifest for Redpanda Console v3 beta: