fix: link in rest migration is wrong (#12564)

CHANGELOG.md

@@ -241,7 +241,7 @@ empty coins slice before it is used to create `banktype.MsgSend`.
 
 * [\#11797](https://github.com/cosmos/cosmos-sdk/pull/11797) Remove all RegisterRESTRoutes (previously deprecated)
 * [\#11089](https://github.com/cosmos/cosmos-sdk/pull/11089]) interacting with the node through `grpc.Dial` requires clients to pass a codec refer to [doc](docs/run-node/interact-node.md).
-* [\#9594](https://github.com/cosmos/cosmos-sdk/pull/9594) Remove legacy REST API. Please see the [REST Endpoints Migration guide](https://docs.cosmos.network/master/migrations/rest.html) to migrate to the new REST endpoints.
+* [\#9594](https://github.com/cosmos/cosmos-sdk/pull/9594) Remove legacy REST API. Please see the [REST Endpoints Migration guide](https://docs.cosmos.network/v0.45/migrations/rest.html) to migrate to the new REST endpoints.
 * [\#9995](https://github.com/cosmos/cosmos-sdk/pull/9995) Increased gas cost for creating proposals.
 * [\#11029](https://github.com/cosmos/cosmos-sdk/pull/11029) The deprecated Vote Option field is removed in gov v1beta2 and nil in v1beta1. Use Options instead.
 * [\#11013](https://github.com/cosmos/cosmos-sdk/pull/11013) The `tx gov submit-proposal` command has changed syntax to support the new Msg-based gov proposals. To access the old CLI command, please use `tx gov submit-legacy-proposal`.
@@ -664,7 +664,7 @@ Security Release. No breaking changes related to 0.44.x.
 
 ### Client Breaking Changes
 
-* [\#10041](https://github.com/cosmos/cosmos-sdk/pull/10041) Remove broadcast & encode legacy REST endpoints. Please see the [REST Endpoints Migration guide](https://docs.cosmos.network/master/migrations/rest.html) to migrate to the new REST endpoints.
+* [\#10041](https://github.com/cosmos/cosmos-sdk/pull/10041) Remove broadcast & encode legacy REST endpoints. Please see the [REST Endpoints Migration guide](https://docs.cosmos.network/v0.45/migrations/rest.html) to migrate to the new REST endpoints.
 
 ## [v0.43.0](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.43.0) - 2021-08-10