Fix links in release notes (#1277)

RELEASES.md

@@ -11,13 +11,13 @@ This is the case in the latest release of the [`substrate-contracts-node`](https
 [v0.16.0](https://github.com/paritytech/substrate-contracts-node/releases/tag/v0.16.0).
 
 ## Added
-- Contract size optimization in case contract doesn't accept payment ‒ [#1267](https://github.com/paritytech/ink/pull/1270) [#1273](https://github.com/paritytech/ink/pull/1267) (thanks [@xgreenx](https://github.com/xgreenx)).
+- Contract size optimization in case contract doesn't accept payment ‒ [#1267](https://github.com/paritytech/ink/pull/1267) (thanks [@xgreenx](https://github.com/xgreenx)).
 
 ## Changed
 - Two functions have been stabilized: [`ink_env::ecdsa_recover`](https://paritytech.github.io/ink/ink_env/fn.ecdsa_recover.html) and [`ink_env::ecdsa_to_eth_address`](https://paritytech.github.io/ink/ink_env/fn.ecdsa_to_eth_address.html) ‒ [#1270](https://github.com/paritytech/ink/pull/1270) [#1273](https://github.com/paritytech/ink/pull/1273)
 
 ## Fixed
-- Fixed bug with recent Rust and `cargo test` ‒ [#1272](https://github.com/paritytech/ink/pull/1270) [#1273](https://github.com/paritytech/ink/pull/1272) (thanks [@xgreenx](https://github.com/xgreenx)).
+- Fixed bug with recent Rust and `cargo test` ‒ [#1272](https://github.com/paritytech/ink/pull/1272) (thanks [@xgreenx](https://github.com/xgreenx)).
 
 # Version 3.1.0