(DOCS-14261) Correct k8s secret name for agents (#521)

* (DOCS-14261) Correct k8s secret name for agents

Author: zach-carr

source/includes/options-k8s-shared.yaml

@@ -1114,17 +1114,25 @@ description: |
 
   Specifies the |k8s-secret| that contains the {+mdbagent+}'s
   |tls| certificate.
+
+  This secret must contain the following keys, the 
+  values of which are |tls| certificates that can be validated by the 
+  server:
   
+  - ``mms-automation-agent-pem``
+  - ``mms-backup-agent-pem``
+  - ``mms-monitoring-agent-pem``
+
   You must create this secret in the same namespace to which you
   deploy the |k8s-op-short|:
 
   .. code-block:: sh
 
-     kubectl create secret generic agent-cert \
-     --from-file=mms-automation-agent-pem=agent-cert.pem -n <namespace>
-
-  This secret must contain a ``mms-automation-agent-pem`` key, the value
-  of which is a |tls| certificate that can be validated by the server.
+     kubectl create secret generic agent-certs \
+     --from-file=mms-automation-agent-pem=<automation-cert.pem> \
+     --from-file=mms-backup-agent-pem=<backup-cert.pem> \
+     --from-file=mms-monitoring-agent-pem=<monitoring-cert.pem> \
+     -n <namespace>
 
   This setting is required if 
   :setting:`spec.security.authentication.requireClientTLSAuthentication` is ``true``.