Release notes: integrate detached & rm backports

Author: harding

doc/release-notes-14941.md

@@ -190,14 +190,18 @@ Deprecated or removed RPCs
 New RPCs
 --------
 
-- A new `getnodeaddresses` RPC returns peer addresses known to this
+- The `getnodeaddresses` RPC returns peer addresses known to this
   node. It may be used to find nodes to connect to without using a DNS
   seeder.
 
-- A new `listwalletdir` RPC returns a list of wallets in the wallet
+- The `listwalletdir` RPC returns a list of wallets in the wallet
   directory (either the default wallet directory or the directory
   configured by the `-walletdir` parameter).
 
+- The `getrpcinfo` returns runtime details of the RPC server. At the
+  moment, it returns an array of the currently active commands and how
+  long they've been running.
+
 Updated RPCs
 ------------
 
@@ -260,6 +264,16 @@ in the Low-level Changes section below.
   blockhash is provided, check the mempool. 3. If no blockhash is
   provided but txindex is enabled, also check txindex.
 
+- The `unloadwallet` RPC is now synchronous, meaning it will not return
+  until the wallet is fully unloaded.
+
+REST changes
+------------
+
+- A new `/rest/blockhashbyheight/` endpoint is added for fetching the
+  hash of the block in the current best blockchain based on its height
+  (how many blocks it is after the Genesis Block).
+
 Graphical User Interface (GUI)
 ------------------------------