CHANGELOG:Add entry for downstream endpoint bridge polling.

Signed-off-by: Faizan Ali <faizana@nvidia.com>

Author: faizana-nvidia

CHANGELOG.md

@@ -36,6 +36,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
    for Endpoint Discovery -> Endpoint Discovery), where permitted by transport
    type.
 
+8. `mctpd` now implements bridge endpoint polling after successful dynamic pool
+   space allocation. Once endpoint is establised as accessible i.e if it responds
+   to send poll command, polling on that endpoint would stop.
+
 ## [2.2] - 2025-07-28
 
 ### Fixed