DOCSP-31631 v6.0 Remove Duplicate Admonition (#4146)

Author: ianf-mongodb

source/core/queryable-encryption/features.txt

@@ -188,12 +188,6 @@ cannot protect your data from a privileged user or as it sits on disk.
 To learn more, see
 :manual:`Transport Encryption using TLS/SSL </core/security-transport-encryption/>`
 
-.. important:: Use the Mechanisms Together
-
-   To secure a production deployment, use all the security mechanisms
-   discussed in this guide together. The mechanisms are not mutually
-   exclusive.
-
 Comparison of Features
 ----------------------