Remove mentions to beta in ddc

datacenter/dtr/2.1/guides/high-availability/backups-and-disaster-recovery.md

@@ -59,7 +59,7 @@ As an example, to create a backup of a DTR node, you can use:
 
 ```bash
 # Create the backup
-$ docker run -i --rm docker/dtr:2.1.0-beta3 backup \
+$ docker run -i --rm docker/dtr backup \
   --ucp-url <ucp-url> \
   --ucp-insecure-tls \
   --existing-replica-id <replica-id> \
@@ -109,7 +109,7 @@ state from an existing backup:
 ```bash
 # Install and restore configurations from an existing backup
 $ docker run -i --rm \
-  docker/dtr:2.1.0-beta3 restore \
+  docker/dtr restore \
   --ucp-url <ucp-url> \
   --ucp-insecure-tls \  
   --ucp-username <ucp-admin> \

datacenter/dtr/2.1/guides/install/index.md

@@ -111,7 +111,7 @@ replicas:
 
     ```bash
     $ docker run -it --rm \
-      docker/dtr:2.1.0-beta3 join \
+      docker/dtr join \
       --ucp-node <ucp-node-name> \
       --ucp-insecure-tls
     ```

datacenter/dtr/2.1/guides/install/uninstall.md

@@ -17,7 +17,7 @@ To see what options are available in the uninstall command, check the
 [uninstall command reference](../../reference/cli/remove.md), or run:
 
 ```bash
-$ docker run -it --rm docker/dtr:2.1.0-beta3 remove --help
+$ docker run -it --rm docker/dtr remove --help
 ```
 
 To remove a replica safely, you must tell the bootstrapper about one healthy replica
@@ -33,7 +33,7 @@ remove a DTR replica from a cluster with multiple replicas:
 ```bash
 
 $ docker run -it --rm \
-  docker/dtr:2.1.0-beta3 remove \
+  docker/dtr remove \
   --ucp-insecure-tls
 
 existing-replica-id (ID of an existing replica in a cluster): 7ae3cb044b70