fix link

Author: lindseymoore

source/security/authentication.txt

@@ -27,7 +27,7 @@ server to ensure security.
 
 To learn more about the connection string formats and authentication options,
 see the :manual:`Connection String Formats
-</reference/connection-string/#authentication-options >` section
+</reference/connection-string/#connection-string-formats>` section
 of the Connection Strings guide in the Server manual.
 
 .. note:: Enterprise Authentication Mechanisms