DOCSP-29260: Make KMongo deprecation an important admonition (#119)

# Pull Request Info

Miss from merged #92

JIRA - https://jira.mongodb.org/browse/DOCSP-29260
Staging -
https://docs-mongodbcom-staging.corp.mongodb.com/kotlin/docsworker-xlarge/no-jira-fix-kmongo-includes/migrate-kmongo/

---------

Co-authored-by: Rea Rustagi <[email protected]>
(cherry picked from commit f3dfc0e)

Author: cbullinger

source/includes/kmongo-description.rst

@@ -1,5 +1,8 @@
 `KMongo <https://litote.org/kmongo/>`__ is a popular community-developed library
 for working with MongoDB from Kotlin applications.
-It is also a wrapper around the Java driver.
-It was created prior to the creation of the official Kotlin driver to serve
-the needs of the Kotlin community. As of July 2023, it has been marked as deprecated.
+It is a wrapper around the Java driver that was created prior to the creation of 
+the official Kotlin driver to serve the needs of the Kotlin community. 
+
+.. important:: 
+
+   As of July 2023, KMongo has been marked as deprecated.