docs: add release-notes for 0.17.0.

docs/release-notes/release-notes-0.17.0.md

@@ -163,6 +163,11 @@ unlock or create.
 
 * Fixed a memory leak found in mempool management handled by
   [`btcwallet`](https://github.com/lightningnetwork/lnd/pull/7767).
+  
+* Make sure lnd starts up as normal in case a transaction does not meet min
+  mempool fee requirements. [Handle min mempool fee backend error when a
+  transaction fails to be broadcasted by the 
+  bitcoind backend](https://github.com/lightningnetwork/lnd/pull/7746)
 
 * [Updated bbolt to v1.3.7](https://github.com/lightningnetwork/lnd/pull/7796)
   in order to address mmap issues affecting certain older iPhone devices.