DIP-0026: add release notes for multi-party payouts

Author: hilawe

doc/release-notes-7353.md

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+Notable changes
+===============
+
+Consensus / Masternodes
+-----------------------
+
+- DIP-0026 (Multi-Party Payouts) is implemented behind a new version-bits deployment, `v25`
+  (EHF, version bit 13), which additionally requires `v24` (extended addresses) to be active.
+  Once `v25` activates, a masternode can split its owner-side block reward on-chain among up to
+  32 payees instead of a single owner payout, using a new version 4 ProRegTx/ProUpRegTx. All
+  pre-activation behavior is unchanged: version 4 transactions are rejected until `v25` is active,
+  and the serialized forms for existing (pre-v4) masternodes are byte-for-byte identical. The
+  coinbase splits the owner reward across the payees by basis points (floor with a deterministic
+  one-duff remainder), summing to the owner reward exactly. (#7353)
+
+RPC
+---
+
+- `protx register`, `protx register_fund`, `protx register_prepare` and `protx update_registrar`
+  now accept the `payoutAddress` argument either as a single address (unchanged) or, once DIP-0026
+  (`v25`) is active, as a JSON object mapping each payout address to its share in basis points
+  (1-10000), e.g. `{"XaddrA": 6000, "XaddrB": 4000}`. The shares must be unique and sum to exactly
+  10000. Over dash-cli the object is passed as a quoted JSON string. (#7353)
+
+- `protx info`, `protx list` and `masternodelist` now report a `payoutShares` array for version 4
+  masternodes; the single `payoutAddress` field is omitted for those entries. Output for pre-v4
+  masternodes is unchanged. (#7353)