Update docker version for 2.x (#4451)

Signed-off-by: Fanit Kolchina <[email protected]>

_install-and-configure/install-dashboards/docker.md

@@ -12,7 +12,7 @@ redirect_from:
 
 You *can* start OpenSearch Dashboards using `docker run` after [creating a Docker network](https://docs.docker.com/engine/reference/commandline/network_create/) and starting OpenSearch, but the process of connecting OpenSearch Dashboards to OpenSearch is significantly easier with a Docker Compose file.
 
-1. Run `docker pull opensearchproject/opensearch-dashboards:{{site.opensearch_dashboards_version}}`.
+1. Run `docker pull opensearchproject/opensearch-dashboards:2`.
 
 1. Create a [`docker-compose.yml`](https://docs.docker.com/compose/compose-file/) file appropriate for your environment. A sample file that includes OpenSearch Dashboards is available on the OpenSearch [Docker installation page]({{site.url}}{{site.baseurl}}/opensearch/install/docker#sample-docker-composeyml).
 

_install-and-configure/install-opensearch/docker.md

@@ -60,17 +60,27 @@ Official OpenSearch images are hosted on [Docker Hub](https://hub.docker.com/u/o
 
 [Docker Hub](https://hub.docker.com/u/opensearchproject/):
 ```bash
-docker pull opensearchproject/opensearch:latest
-docker pull opensearchproject/opensearch-dashboards:latest
+docker pull opensearchproject/opensearch:2
 ```
+{% include copy.html %}
+
+```bash
+docker pull opensearchproject/opensearch-dashboards:2
+```
+{% include copy.html %}
 
 [Amazon ECR](https://gallery.ecr.aws/opensearchproject/):
 ```bash
-docker pull public.ecr.aws/opensearchproject/opensearch:latest
-docker pull public.ecr.aws/opensearchproject/opensearch-dashboards:latest
+docker pull public.ecr.aws/opensearchproject/opensearch:2
 ```
+{% include copy.html %}
+
+```bash
+docker pull public.ecr.aws/opensearchproject/opensearch-dashboards:2
+```
+{% include copy.html %}
 
-To download a specific version of OpenSearch or OpenSearch Dashboards other than the latest available version, modify the image tag where it is referenced (either in the command line or in a Docker Compose file). For example, `opensearchproject/opensearch:{{site.opensearch_version}}` will pull OpenSearch version {{site.opensearch_version}}. Refer to the official image repositories for available versions. 
+To download a specific version of OpenSearch or OpenSearch Dashboards other than the latest available version, modify the image tag where it is referenced (either in the command line or in a Docker Compose file). For example, `opensearchproject/opensearch:{{site.opensearch_version}}` will pull OpenSearch version {{site.opensearch_version}}. To pull the latest version, use `opensearchproject/opensearch:latest`. Refer to the official image repositories for available versions. 
 {: .tip}
 
 Before continuing, you should verify that Docker is working correctly by deploying OpenSearch in a single container.