Merge bitcoin/bitcoin#22296: doc: Final merge of release notes snippets, mv to wiki

fa09fd1 doc: Final merge of release notes snippets (MarcoFalke)

Pull request description:

  None of the remaining pulls tagged for 22.0 have snippets, so merge them and move them to the wiki.

  Trivial to review with `--color-moved=dimmed-zebra`.

ACKs for top commit:
  laanwj:
    ACK fa09fd1
  jonatack:
    ACK fa09fd1

Tree-SHA512: d5d272a9fc2217a87988efa189000cae5330da22f0459dd5e4340a18aba3d67d8fe8661016cb777e2e15f5d137c1c2b3de7d576c942eaf4201dabdc4e9c783f4

Author: MarcoFalke

doc/release-notes-20833.md

@@ -1,3 +1,5 @@
+# Release notes now being edited on https://github.com/bitcoin-core/bitcoin-devwiki/wiki/22.0-Release-Notes-draft
+
 *After branching off for a major version release of Bitcoin Core, use this
 template to create the initial release notes draft.*
 
@@ -121,6 +123,18 @@ Updated RPCs
 - `getnodeaddresses` now also accepts a "network" argument (ipv4, ipv6, onion,
   or i2p) to return only addresses of the specified network.  (#21843)
 
+- The `testmempoolaccept` RPC now accepts multiple transactions (still experimental at the moment,
+  API may be unstable). This is intended for testing transaction packages with dependency
+  relationships; it is not recommended for batch-validating independent transactions. In addition to
+  mempool policy, package policies apply: the list cannot contain more than 25 transactions or have a
+  total size exceeding 101K virtual bytes, and cannot conflict with (spend the same inputs as) each other or
+  the mempool, even if it would be a valid BIP125 replace-by-fee. There are some known limitations to
+  the accuracy of the test accept: it's possible for `testmempoolaccept` to return "allowed"=True for a
+  group of transactions, but "too-long-mempool-chain" if they are actually submitted. (#20833)
+
+- `addmultisigaddress` and `createmultisig` now support up to 20 keys for
+  Segwit addresses. (#20867)
+
 Changes to Wallet or GUI related RPCs can be found in the GUI or Wallet section below.
 
 New RPCs
@@ -152,6 +166,10 @@ Tools and Utilities
   like `-onlynet=<network>` or to upgrade to this release of Bitcoin Core 22.0
   that supports Tor v3 only.  (#21595)
 
+- A new `-rpcwaittimeout` argument to `bitcoin-cli` sets the timeout
+  in seconds to use with `-rpcwait`. If the timeout expires,
+  `bitcoin-cli` will report a failure. (#21056)
+
 Wallet
 ------
 
@@ -167,6 +185,9 @@ Wallet
   Note that the resulting transaction may become invalid if one of the unsafe inputs disappears.
   If that happens, the transaction must be funded with different inputs and republished. (#21359)
 
+- We now support up to 20 keys in `multi()` and `sortedmulti()` descriptors
+  under `wsh()`. (#20867)
+
 GUI changes
 -----------