Merge bitcoin/bitcoin#28637: doc: add release note for #27460 (new importmempool RPC)

1b672eb doc: add release note for #27460 (new `importmempool` RPC) (Sebastian Falbesoner)

Pull request description:

  This PR adds a missing release note for #27460.

ACKs for top commit:
  glozow:
    ACK 1b672eb

Tree-SHA512: 89deadbfd6779e6eb19801c9fe7459a9876b920d44e09df102774c1eb8b3c0716462613dc99d1711eda4bd959ea61595b33f4528424ac02cf1af6cb4e5f1f0e9

Author: glozow

doc/release-notes-27460.md

@@ -0,0 +1,7 @@
+- A new `importmempool` RPC has been added. It loads a valid `mempool.dat` file and attempts to
+  add its contents to the mempool. This can be useful to import mempool data from another node
+  without having to modify the datadir contents and without having to restart the node. (#27460)
+    - Warning: Importing untrusted files is dangerous, especially if metadata from the file is taken over.
+    - If you want to apply fee deltas, it is recommended to use the `getprioritisedtransactions` and
+      `prioritisetransaction` RPCs instead of the `apply_fee_delta_priority` option to avoid
+      double-prioritising any already-prioritised transactions in the mempool.