added auth changelog (#413)

Author: tiffany-mintlify

changelog/overview.mdx

@@ -3,6 +3,17 @@ title: "Product Updates"
 description: "New updates and improvements"
 mode: "wide"
 ---
+<Update label="December 2024">
+  ## Authentication
+    <Frame>
+    <img src="/images/changelog/authentication.png" alt="Authentication screenshot" />
+    </Frame> 
+    Make docs private by setting up authentication via JWT, OAuth, or a universal password. With this privacy, you can create an internal knowledge base or prevent competitors from seeing your docs.
+
+
+
+</Update>
+
 
 <Update label="November 2024">
   ## AI Assistant