doc: add WIP release notes for 23.3

It's not clear if a 23.3 will be released, but update the release-notes
to reflect the currently backported changes.

doc/release-notes.md

@@ -1,9 +1,9 @@
-23.2 Release Notes
+23.3rc1 Release Notes
 ==================
 
-Bitcoin Core version 23.2 is now available from:
+Bitcoin Core version 23.3rc1 is now available from:
 
-  <https://bitcoincore.org/bin/bitcoin-core-23.2/>
+  <https://bitcoincore.org/bin/bitcoin-core-23.3/test.rc1>
 
 This release includes various bug fixes and performance
 improvements, as well as updated translations.
@@ -37,36 +37,21 @@ Core should also work on most other Unix-like systems but is not as
 frequently tested on them.  It is not recommended to use Bitcoin Core on
 unsupported systems.
 
-### P2P
+### RPC
 
-- #26909 net: prevent peers.dat corruptions by only serializing once
-- #27608 p2p: Avoid prematurely clearing download state for other peers
-- #27610 Improve performance of p2p inv to send queues
+- #27727 rpc: Fix invalid bech32 address handling
 
 ### Build system
 
-- #25436 build: suppress array-bounds errors in libxkbcommon
-- #25763 bdb: disable Werror for format-security
-- #26944 depends: fix systemtap download URL
-- #27462 depends: fix compiling bdb with clang-16 on aarch64
-
-### Miscellaneous
-
-- #25444 ci: macOS task imrovements
-- #26388 ci: Use macos-ventura-xcode:14.1 image for "macOS native" task
-- #26924 refactor: Add missing includes to fix gcc-13 compile error
+- #28097 depends: xcb-proto 1.15.2
 
 Credits
 =======
 
 Thanks to everyone who directly contributed to this release:
 
-- Anthony Towns
-- Hennadii Stepanov
 - MacroFake
-- Martin Zumsande
 - Michael Ford
-- Suhas Daftuar
 
 As well as to everyone that helped with translations on
 [Transifex](https://www.transifex.com/bitcoin/bitcoin/).