doc: add historical 0.21.2 release notes

doc/release-notes/release-notes-0.21.2.md

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+0.21.2 Release Notes
+====================
+
+Bitcoin Core version 0.21.2 is now available from:
+
+  <https://bitcoincore.org/bin/bitcoin-core-0.21.2/>
+
+This minor release includes various bug fixes and performance
+improvements, as well as updated translations.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://bitcoincore.org/en/list/announcements/join/>
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes in some cases), then run the
+installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on Mac)
+or `bitcoind`/`bitcoin-qt` (on Linux).
+
+Upgrading directly from a version of Bitcoin Core that has reached its EOL is
+possible, but it might take some time if the data directory needs to be migrated. Old
+wallet versions of Bitcoin Core are generally supported.
+
+Compatibility
+==============
+
+Bitcoin Core is supported and extensively tested on operating systems
+using the Linux kernel, macOS 10.12+, and Windows 7 and newer.  Bitcoin
+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.
+
+From Bitcoin Core 0.20.0 onwards, macOS versions earlier than 10.12 are no
+longer supported. Additionally, Bitcoin Core does not yet change appearance
+when macOS "dark mode" is activated.
+
+
+0.21.2 change log
+=================
+
+### P2P protocol and network code
+
+- #21644 use NetPermissions::HasFlag() in CConnman::Bind() (jonatack)
+- #22569 Rate limit the processing of rumoured addresses (sipa)
+
+### Wallet
+
+- #21907 Do not iterate a directory if having an error while accessing it (hebasto)
+
+### RPC
+
+- #19361 Reset scantxoutset progress before inferring descriptors (prusnak)
+
+### Build System
+
+- #21932 depends: update Qt 5.9 source url (kittywhiskers)
+- #22017 Update Windows code signing certificate (achow101)
+- #22191 Use custom MacOS code signing tool (achow101)
+- #22713 Fix build with Boost 1.77.0 (sizeofvoid)
+
+### Tests and QA
+
+- #20182 Build with --enable-werror by default, and document exceptions (hebasto)
+- #20535 Fix intermittent feature_taproot issue (MarcoFalke)
+- #21663 Fix macOS brew install command (hebasto)
+- #22279 add missing ECCVerifyHandle to base_encode_decode (apoelstra)
+- #22730 Run fuzzer task for the master branch only (hebasto)
+
+### GUI
+
+- #277 Do not use QClipboard::Selection on Windows and macOS. (hebasto)
+- #280 Remove user input from URI error message (prayank23)
+- #365 Draw "eye" sign at the beginning of watch-only addresses (hebasto)
+
+### Miscellaneous
+
+- #22002 Fix crash when parsing command line with -noincludeconf=0 (MarcoFalke)
+- #22137 util: Properly handle -noincludeconf on command line (take 2) (MarcoFalke)
+
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- Andrew Chow
+- Andrew Poelstra
+- fanquake
+- Hennadii Stepanov
+- Jon Atack
+- Kittywhiskers Van Gogh
+- Luke Dashjr
+- MarcoFalke
+- Pavol Rusnak
+- Pieter Wuille
+- prayank23
+- Rafael Sadowski
+- W. J. van der Laan
+
+
+As well as to everyone that helped with translations on
+[Transifex](https://www.transifex.com/bitcoin/bitcoin/).