doc: update release notes for 28.1rc2

doc/release-notes.md

@@ -46,6 +46,19 @@ Notable changes
 
 ### P2P
 
+- When the `-port` configuration option is used, the default onion listening port will now
+  be derived to be that port + 1 instead of being set to a fixed value (8334 on mainnet).
+  This re-allows setups with multiple local nodes using different `-port` and not using `-bind`,
+  which would lead to a startup failure in v28.0 due to a port collision.
+
+  Note that a `HiddenServicePort` manually configured in `torrc` may need adjustment if used in
+  connection with the `-port` option.
+  For example, if you are using `-port=5555` with a non-standard value and not using `-bind=...=onion`,
+  previously Bitcoin Core would listen for incoming Tor connections on `127.0.0.1:8334`.
+  Now it would listen on `127.0.0.1:5556` (`-port` plus one). If you configured the hidden service manually
+  in torrc now you have to change it from `HiddenServicePort 8333 127.0.0.1:8334` to `HiddenServicePort 8333
+  127.0.0.1:5556`, or configure bitcoind with `-bind=127.0.0.1:8334=onion` to get the previous behavior.
+  (#31223)
 - #30568 addrman: change internal id counting to int64_t
 
 ### Key
@@ -59,6 +72,8 @@ Notable changes
 ### Test
 
 - #31016 test: add missing sync to feature_fee_estimation.py
+- #31448 fuzz: add cstdlib to FuzzedDataProvider
+- #31419 test: fix MIN macro redefinition
 
 ### Doc
 
@@ -71,6 +86,7 @@ Notable changes
 ### Misc
 
 - #31267 refactor: Drop deprecated space in `operator""_mst`
+- #31431 util: use explicit cast in MultiIntBitSet::Fill()
 
 Credits
 =======