doc: Add release notes for 15620

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+Updated RPCs
+------------
+
+* The -maxtxfee setting no longer has any effect on non-wallet RPCs.
+
+  The `sendrawtransaction` and `testmempoolaccept` RPC methods previously
+  accepted an `allowhighfees` parameter to fail the mempool acceptance in case
+  the transaction's fee would exceed the value of the command line argument
+  `-maxtxfee`. To uncouple the RPCs from the global option, they now have a
+  hardcoded default for the maximum transaction fee, that can be changed for
+  both RPCs on a per-call basis with the `maxfeerate` parameter. The
+  `allowhighfees` boolean option has been removed and replaced by the
+  `maxfeerate` numeric option.