(typo-fix): authentication (#259)

Author: jwilliams-mongo

source/connect.txt

@@ -43,7 +43,7 @@ Considerations
   :guilabel:`SRV record` or :guilabel:`Replica Set Name` when 
   filling in your connection information.
 
-- If you are using Kerberos as your authenticaion mechanism, do not 
+- If you are using Kerberos as your authentication mechanism, do not 
   specify the :guilabel:`Password` in the connection form.
 
 - .. include:: /includes/fact-non-genuine-warning.rst