doc: Add PR and author list to release notes for 0.21.1

Tree-SHA512: c74b12dee645bd8d3dcff8d572a82369ea0895339d0d12e5360182421fa8cef4d3eba309ff7668e97dc24cd6afc800ab9ceb4eca5458085acf12c368f6c2f859

Author: laanwj

doc/release-notes.md

@@ -51,12 +51,64 @@ RPC
 0.21.1 change log
 =================
 
+### Consensus
+- #21377 Speedy trial support for versionbits (ajtowns)
+- #21686 Speedy trial activation parameters for Taproot (achow101)
+
+### P2P protocol and network code
+- #20852 allow CSubNet of non-IP networks (vasild)
+- #21043 Avoid UBSan warning in ProcessMessage(…) (practicalswift)
+
+### Wallet
+- #21166 Introduce DeferredSignatureChecker and have SignatureExtractorClass subclass it (achow101)
+- #21083 Avoid requesting fee rates multiple times during coin selection (achow101)
+
+### RPC and other APIs
+- #21201 Disallow sendtoaddress and sendmany when private keys disabled (achow101)
+
+### Build system
+- #21486 link against -lsocket if required for `*ifaddrs` (fanquake)
+- #20983 Fix MSVC build after gui#176 (hebasto)
+
+### Tests and QA
+- #21380 Add fuzzing harness for versionbits (ajtowns)
+- #20812 fuzz: Bump FuzzedDataProvider.h (MarcoFalke)
+- #20740 fuzz: Update FuzzedDataProvider.h from upstream (LLVM) (practicalswift)
+- #21446 Update vcpkg checkout commit (sipsorcery)
+- #21397 fuzz: Bump FuzzedDataProvider.h (MarcoFalke)
+- #21081 Fix the unreachable code at `feature_taproot` (brunoerg)
+- #20562 Test that a fully signed tx given to signrawtx is unchanged (achow101)
+- #21571 Make sure non-IP peers get discouraged and disconnected (vasild, MarcoFalke)
+- #21489 fuzz: cleanups for versionbits fuzzer (ajtowns)
+
+### Miscellaneous
+- #20861 BIP 350: Implement Bech32m and use it for v1+ segwit addresses (sipa)
+
+### Documentation
+- #21384 add signet to bitcoin.conf documentation (jonatack)
+- #21342 Remove outdated comment (hebasto)
 
 Credits
 =======
 
 Thanks to everyone who directly contributed to this release:
 
+- Aaron Clauson
+- Andrew Chow
+- Anthony Towns
+- Bruno Garcia
+- Fabian Jahr
+- fanquake
+- Hennadii Stepanov
+- Jon Atack
+- Luke Dashjr
+- MarcoFalke
+- Pieter Wuille
+- practicalswift
+- randymcmillan
+- Sjors Provoost
+- Vasil Dimov
+- W. J. van der Laan
 
 As well as to everyone that helped with translations on
 [Transifex](https://www.transifex.com/bitcoin/bitcoin/).