Add limitation related to setting data dir when joining nodes (#3031)

Author: paigecalvert

docs/enterprise/embedded-manage-nodes.mdx

@@ -10,6 +10,8 @@ Multi-node clusters with Embedded Cluster have the following limitations:
 
 * High availability for Embedded Cluster in an Alpha feature. This feature is subject to change, including breaking changes. To get access to this feature, reach out to Alex Parker at [[email protected]](mailto:[email protected]).
 
+* The same Embedded Cluster data directory used at installation is used for all nodes joined to the cluster. This is either the default `/var/lib/embedded-cluster` directory or the directory set with the [`--data-dir`](/reference/embedded-cluster-install#flags) flag. You cannot choose a different data directory for Embedded Cluster when joining nodes.
+
 ## Add Nodes to a Cluster (Beta) {#add-nodes}
 
 You can add nodes to create a multi-node cluster in online (internet-connected) and air-gapped (limited or no outbound internet access) environments. The Admin Console provides the join command that you use to join nodes to the cluster.

docs/partials/embedded-cluster/_requirements.mdx

@@ -10,9 +10,7 @@
 
 * The filesystem at `/var/lib/embedded-cluster` has 40Gi or more of total space and must be less than 80% full
 
-   :::note
-   The directory used for data storage can be changed by passing the `--data-dir` flag with the Embedded Cluster install command. For more information, see [Embedded Cluster Install Command Options](/reference/embedded-cluster-install).
-   :::
+   The directory used for data storage can be changed by passing the `--data-dir` flag with the Embedded Cluster `install` command. For more information, see [Embedded Cluster Install Command Options](/reference/embedded-cluster-install).
 
    Note that in addition to the primary `/var/lib/embedded-cluster` directory, Embedded Cluster creates directories and files in the following locations:
 

docs/reference/embedded-cluster-install.mdx

@@ -60,6 +60,7 @@ sudo ./APP_SLUG install --license LICENSE_FILE [flags]
         <p>**Limitations:**</p>
         <ul>
             <li>The data directory for Embedded Cluster cannot be changed after the cluster is installed.</li>
+            <li>For multi-node installations, the same data directory that is supplied at installation is used for all nodes joined to the cluster. You cannot choose a different data directory when joining nodes with the Embedded Cluster `join` command. For more information about joining nodes, see [Add Nodes to a Cluster](/enterprise/embedded-manage-nodes#add-nodes) in _Managing Multi-Node Clusters with Embedded Cluster_.</li>
             <li>If you use the `--data-dir` flag to change the data directory during installation, then you must use the same location when restoring in a disaster recovery scenario. For more information about disaster recovery with Embedded Cluster, see [Disaster Recovery for Embedded Cluster](/vendor/embedded-disaster-recovery).</li>
             <li>Replicated does not support using symlinks for the Embedded Cluster data directory. Use the `--data-dir` flag instead of symlinking `/var/lib/embedded-cluster`.</li>
         </ul>