Update best-practices.md

fixing typo

Author: v-albemi

articles/aks/best-practices.md

@@ -36,7 +36,7 @@ As a cluster operator, work together with application owners and developers to u
 * [Best practices for cluster security and upgrades](operator-best-practices-cluster-security.md)
     * Includes securing access to the API server, limiting container access, and managing upgrades and node reboots.
 * [Best practices for container image management and security](operator-best-practices-container-image-management.md)
-    * Includes securing the image and runtimes and automated builds on base image updates..
+    * Includes securing the image and runtimes and automated builds on base image updates.
 * [Best practices for pod security](developer-best-practices-pod-security.md)
     * Includes securing access to resources, limiting credential exposure, and using pod identities and digital key vaults.