DOCSP-48546: Add AWS Lambda link (#121)

(cherry picked from commit baa2b78)

Author: mcmorisi

source/connect.txt

@@ -26,6 +26,7 @@ Connect to MongoDB
    Stable API </connect/stable-api>
    Choose a Connection Target </connect/connection-targets>
    Configure TLS </connect/tls>
+   AWS Lambda <https://www.mongodb.com/docs/atlas/manage-connections-aws-lambda/>
 .. /connect/server-selection
 
 Overview