(DOCSP-40326) Adds warning about bug in EOL versions. (#1748)

* (DOCSP-40326) Adds warning about bug in EOL versions.

* Revises per copy review.

Author: erabil-mdb

source/tutorial/upgrade-k8s-operator.txt

@@ -21,6 +21,14 @@ to its latest version.
 
    .. include:: /includes/summary-1-20-suffix-change.rst
 
+
+.. warning::
+
+   Starting from 1.17, the |k8s-op-short| has a known bug that causes the upgrade 
+   process to fail if the repository for images contains a colon (``:``). For example, 
+   using a repository URL like ``repo:5000/myrepomongo`` results in an upgrade failure. 
+   This issue affects versions 1.17 through 1.19.0. However, it is fixed in 1.19.1. 
+   
 Upgrade using |k8s|
 -------------------