(DOCSP-26667)(DOCSP-26668): Clarify FCV behavior for DB resources & AppDB on OM resources (#1143)

* (DOCSP-26667): AppDB will not change FCV automatically when upgrading version

* (DOCSP-26668): Data Deployment will change FCV automatically when upgrading version

* Fix link

* Reword to avoid space in param name

Author: melissamahoney-mongodb

source/includes/options-k8s-shared.yaml

@@ -63,9 +63,11 @@ description: |
 
   .. note::
 
-     If you update this value to a later version, consider setting
-     :setting:`spec.featureCompatibilityVersion` to give yourself the
-     option to downgrade if necessary.
+     If you update this value to a later version of MongoDB for your 
+     database resources, the Feature Compatibility Version (FCV) changes 
+     automatically to this version unless you set :setting:`spec.featureCompatibilityVersion` 
+     to the original version. Consider setting :setting:`spec.featureCompatibilityVersion` 
+     to the original version to give yourself the option to downgrade if necessary.
 
 ---
 program: _shared

source/reference/k8s-operator-om-specification.txt

@@ -114,9 +114,11 @@ resources.
 
    .. note::
 
-      If you update this value to a later version, consider setting
-      :setting:`spec.featureCompatibilityVersion` to give yourself the
-      option to downgrade if necessary.
+      If you update this value to a later version of MongoDB for the 
+      Application Database, the Feature Compatibility Version (FCV) *does 
+      not change* unless you also specify the 
+      ``featureCompatibilityVersion``
+      parameter under :opsmgrkube:`spec.applicationDatabase`.
 
 
 .. _optional-om-k8s-settings: