[doc] update release notes

Release notes are from 18720bc5d5

doc/release-notes.md

@@ -1,6 +1,6 @@
-Bitcoin Core version 29.1rc1 is now available from:
+Bitcoin Core version 29.1rc2 is now available from:
 
-  <https://bitcoincore.org/bin/bitcoin-core-29.1/test.rc1/>
+  <https://bitcoincore.org/bin/bitcoin-core-29.1/test.rc2/>
 
 This release includes various bug fixes and performance
 improvements, as well as updated translations.
@@ -48,6 +48,20 @@ Notable changes
 
 - #32521 policy: make pathological transactions packed with legacy sigops non-standard
 
+- The minimum block feerate (`-blockmintxfee`) has been changed to 1 satoshi per kvB. It can still be changed using the
+configuration option.
+
+- The default minimum relay feerate (`-minrelaytxfee`) and incremental relay feerate (`-incrementalrelayfee`) have been
+changed to 100 satoshis per kvB. They can still be changed using their respective configuration options, but it is
+recommended to change both together if you decide to do so.
+  - Other minimum feerates (e.g. the dust feerate, the minimum returned by the fee estimator, and all feerates used by
+  the wallet) remain unchanged. The mempool minimum feerate still changes in response to high volume.
+  - Note that unless these lower defaults are widely adopted across the network, transactions created with lower fee
+  rates are not guaranteed to propagate or confirm. The wallet feerates remain unchanged; `-mintxfee` must be changed
+  before attempting to create transactions with lower feerates using the wallet.
+
+- #33106 policy: lower the default blockmintxfee, incrementalrelayfee, minrelaytxfee
+
 ### Logging
 
 Unconditional logging to disk is now rate limited by giving each source location
@@ -181,6 +195,7 @@ Thanks to everyone who directly contributed to this release:
 - enirox001
 - fanquake
 - furszy
+- glozow
 - instagibbs
 - Hennadii Stepanov
 - hodlinator