DOC-5210 Updated rladmin cluster certificate reference for customer-provided INE certs

Author: rrelledge

content/operate/rs/references/cli-utilities/rladmin/cluster/certificate.md

@@ -18,9 +18,13 @@ Sets a cluster certificate to a specified PEM file.
 
 ```sh
 rladmin cluster certificate
-        set <certificate name>
-        certificate_file <certificate filepath>
-        [ key_file <key filepath> ]
+        set { <certificate_name> | internal }
+        [ certificate_file <filepath> ]
+        [ key_file <filepath> ]
+        [ cpine_certificate_file <filepath> ]
+        [ cpine_key_file <filepath> ]
+        [ dpine_certificate_file <filepath> ]
+        [ dpine_key_file <filepath> ] 
 ```
 
 To set a certificate for a specific service, use the corresponding certificate name. See the [certificates table]({{< relref "/operate/rs/security/certificates" >}}) for the list of cluster certificates and their descriptions.
@@ -29,18 +33,35 @@ To set a certificate for a specific service, use the corresponding certificate n
 
 | Parameter | Type/Value | Description |
 |-----------|------------|-------------|
-| certificate name | 'cm'<br /> 'api'<br /> 'proxy'<br /> 'syncer'<br /> 'metrics_exporter' | Name of the certificate to update |
+| certificate_name | 'cm'<br /> 'api'<br /> 'proxy'<br /> 'syncer'<br /> 'metrics_exporter' | Name of the certificate to update |
+| internal | | Set up internal certificates for data plane internode encryption (DPINE) and control plane internode encryption (CPINE) |
 | certificate_file | filepath | Path to the certificate file |
 | key_file | filepath | Path to the key file (optional) |
+| dpine_certificate_file | filepath | Path to the data plane internode encryption (DPINE) certificate file (internal certificate) |
+| dpine_key_file | filepath | Path to the data plane internode encryption (DPINE) key file (internal certificate) |
+| cpine_certificate_file | filepath | Path to the control plane internode encryption (CPINE) certificate file (internal certificate) |
+| cpine_key_file | filepath | Path to the control plane internode encryption (CPINE) key file (internal certificate) |
 
 ### Returns
 
 Reports that the certificate was set to the specified file. Returns an error message if the certificate fails to update.
 
-### Example
+### Examples
+
+Update the proxy certificate:
 
 ```sh
 $ rladmin cluster certificate set proxy \
        certificate_file /tmp/proxy.pem
 Set proxy certificate to contents of file /tmp/proxy.pem
 ```
+
+Set up [customer-provided internode encryption certificates]({{<relref "/operate/rs/security/encryption/internode-encryption#customer-provided-certificates">}}):
+
+```sh
+$ rladmin cluster certificate set internal \
+       dpine_certificate_file /tmp/dpine_cert.pem \
+       dpine_key_file /tmp/dpine_key.pem \
+       cpine_certificate_file /tmp/cpine_cert.pem \
+       cpine_key_file /tmp/cpine_key.pem
+```