RS: Added mtls_trusted_ca to the certificates table (#1428)

* DOC-1574 RS: Added mtls_trusted_ca to certificates table

* DOC-1574 Feedback updates and copy edits for certificates overview

Author: rrelledge

content/operate/rs/security/certificates/_index.md

@@ -11,21 +11,26 @@ linkTitle: Certificates
 weight: 60
 ---
 
-Redis Enterprise Software uses self-signed certificates by default to ensure that the product is secure. If using a self-signed certificate is not the right solution for you, you can import a certificate signed by a certificate authority of your choice.
+Redis Enterprise Software uses self-signed certificates by default to ensure that the product is secure. These certificates are autogenerated on the first node of each Redis Enterprise Software installation and are copied to all other nodes added to the cluster.
 
-Here's the list of self-signed certificates that create secure, encrypted connections to your Redis Enterprise cluster:
+You can replace a self-signed certificate with one signed by a certificate authority of your choice.
 
-| Certificate name | Description |
-|------------------|-------------|
-| `api` | Encrypts [REST API]({{< relref "/operate/rs/references/rest-api/" >}}) requests and responses. |
-| `cm` | Secures connections to the Redis Enterprise Cluster Manager UI. |
-| `ldap_client` | Secures connections between LDAP clients and LDAP servers. |
-| `metrics_exporter` | Sends Redis Enterprise metrics to external [monitoring tools]({{< relref "/operate/rs/monitoring/" >}}) over a secure connection. |
-| `proxy` | Creates secure, encrypted connections between clients and databases. |
-| `syncer` | For [Active-Active]({{< relref "/operate/rs/databases/active-active/" >}}) or [Replica Of]({{< relref "/operate/rs/databases/import-export/replica-of/" >}}) databases, encrypts data during the synchronization of participating clusters. |
+## Supported certificates
 
-These self-signed certificates are generated on the first node of each Redis Enterprise Software installation and are copied to all other nodes added to the cluster.
+Here's the list of supported certificates that create secure, encrypted connections to your Redis Enterprise Software cluster:
 
-When you use the default self-signed certificates and you connect to the Cluster Manager UI over a web browser, you'll see an untrusted connection notification.
+| Certificate name | Autogenerated | Description |
+|------------------|:---------------:|-------------|
+| `api` | <span title="Yes">&#x2705;</span> | Encrypts [REST API]({{< relref "/operate/rs/references/rest-api/" >}}) requests and responses. |
+| `cm` | <span title="Yes">&#x2705;</span> | Secures connections to the Redis Enterprise Cluster Manager UI. |
+| `ldap_client` | <span title="No">:x:</span> | Secures connections between LDAP clients and LDAP servers. |
+| `metrics_exporter` | <span title="Yes">&#x2705;</span> | Sends Redis Enterprise metrics to external [monitoring tools]({{< relref "/operate/rs/monitoring/" >}}) over a secure connection. |
+| `mtls_trusted_ca` | <span title="No">:x:</span>  | Required to enable certificate-based authentication for secure, passwordless access to the REST API. |
+| `proxy` | <span title="Yes">&#x2705;</span> | Creates secure, encrypted connections between clients and databases. |
+| `syncer` | <span title="Yes">&#x2705;</span> | For [Active-Active]({{< relref "/operate/rs/databases/active-active/" >}}) or [Replica Of]({{< relref "/operate/rs/databases/import-export/replica-of/" >}}) databases, encrypts data during the synchronization of participating clusters. |
 
-Depending on your browser, you can allow the connection for each session or add an exception to trust the certificate for all future sessions.
+Certificates that are not autogenerated are optional unless you want to use certain features. For example, you must provide your own `ldap_client` certificate to enable [LDAP authentication]({{<relref "/operate/rs/security/access-control/ldap">}}) or an `mtls_trusted_ca` certificate to enable certificate-based authentication.
+
+## Accept self-signed certificates to access the Cluster Manager UI
+
+When you use the default self-signed certificates and you connect to the Cluster Manager UI over a web browser, you'll see an untrusted connection notification. Depending on your browser, you can allow the connection for each session or add an exception to trust the certificate for all future sessions.