PB-2395: explain that bad retry may lead to dropped requests

Author: adk-swisstopo

get-started/retry.md

@@ -9,7 +9,8 @@ Any request you make has the possibility to fail for a variety of reasons. It
 is your responsibility to decide what to do when this happens. When encountering
 transient errors, you will typically want to retry the request. This requires
 some care to do correctly as incorrect retry strategies may cause many requests
-to be (re)sent in a short amount of time. To mitigate this
+to be (re)sent in a short amount of time, which may eventually cause them to be
+throttled or otherwise permanently dropped. To mitigate this
 [thundering herd problem](https://en.wikipedia.org/wiki/Thundering_herd_problem),
 we recommend you implement retries with jittered truncated exponential backoff.