(DOCSP-20731): update additionalMongodConfig description (#817)

Author: jwilliams-mongo

source/includes/options-k8s-shared.yaml

@@ -1392,13 +1392,14 @@ type: collection
 directive: setting
 optional: true
 description: |
-  Additional :manual:`configuration options
-  </reference/configuration-options/#configuration-file-options>` with
+  Additional :opsmgr:`configuration options
+  </reference/deployment-advanced-options/>` with
   which you want to start {{component}}.
 
   The |k8s-op-short| supports all configuration options that the MongoDB
-  version you deploy supports, except that the |k8s-op-short| overrides
-  values that you provide for any of the following options:
+  version you deploy through the {+mdbagent+} supports, except that the 
+  |k8s-op-short| overrides values that you provide for any of the 
+  following options:
 
   - :setting:`net.port`
   - :setting:`net.tls.certificateKeyFile`
@@ -1414,11 +1415,10 @@ description: |
   To learn more about the configuration options that the |k8s-op-short|
   owns, see :ref:`k8s-exclusive-settings`.
 
-  To learn  which configuration options you can use, see
-  :manual:`Configuration File Options
-  </reference/configuration-options/#configuration-file-options>` in the
-  MongoDB Manual for the MongoDB versions you deploy with the
-  |k8s-op-short|.
+  To learn which configuration options you can use, see
+  :opsmgr:`Advanced Options for MongoDB Deployments
+  </reference/deployment-advanced-options/>` in the |onprem| 
+  documentation.
 
 ---
 program: _shared