Merge bitcoin/bitcoin#33075: doc: Add legacy wallet removal release notes

fa45ccc15d doc: Add legacy wallet removal release notes (MarcoFalke)

Pull request description:

  This spans over several pulls, so add a single note for all of them.

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Tree-SHA512: e753cc3afbd66a88099ff62c2591aa31d32d784098e433e392c20a8dfd40d5c85807e955b264a287c3778d68605cd7022278886a43cd1635c080d563c88fc0cc

doc/release-notes-32944-28710-32438-31250.md

@@ -0,0 +1,12 @@
+# Legacy Wallet Removal
+
+BDB legacy wallets can no longer be created or loaded. They can be migrated to
+the new descriptor wallet format. Refer to the `migratewallet` RPC for more
+details.
+
+The legacy wallet removal drops redundant options in the bitcoin-wallet tool,
+such as `-withinternalbdb`, `-legacy`, and `-descriptors`. Moreover, the
+legacy-only RPCs `addmultisigaddress`, `dumpprivkey`, `dumpwallet`,
+`importaddress`, `importmulti`, `importprivkey`, `importpubkey`,
+`importwallet`, `newkeypool`, `sethdseed`, and `upgradewallet`, are removed.
+(#32944, #28710, #32438, #31250)

doc/release-notes-32944.md

@@ -1,3 +0,0 @@
-# RPC
-
-`upgradewallet` has been removed. It was unused and only applied to unsupported legacy wallets.