(DOCSP-29379): Added official image advantages. (#1348)

* (DOCSP-29379): Added official image advantages.

* (DOCSP-29379): Incorporated Will's feedback.

* (DOCSP-29379): Incorporated Nam's feedback.

Author: corryroot

source/tutorial/plan-k8s-op-container-images.txt

@@ -18,6 +18,11 @@ container registry. The |k8s-op-short| images are based on the
 operating system. MongoDB rebuilds |k8s-op-short| images daily for the
 latest operating system and supporting library updates.
 
+Official images provide the following advantages:
+
+- They are rebuilt daily for the latest upstream vulnerability fixes.
+- MongoDB tests, maintains, and supports them.
+
 To view all available versions for each image, see the following links.
 
 .. list-table::