chore: fix #12674 changelog (#12746)

## Description

ref https://github.com/cosmos/cosmos-sdk/pull/12674#issuecomment-1196667641

---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/main/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/main/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

CHANGELOG.md

@@ -46,6 +46,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Improvements
 
 * [#12717](https://github.com/cosmos/cosmos-sdk/pull/12717) Use injected encoding params in simapp.
+* (x/bank) [#12674](https://github.com/cosmos/cosmos-sdk/pull/12674) Add convenience function `CreatePrefixedAccountStoreKey()` to construct key to access account's balance for a given denom.
 * [#12702](https://github.com/cosmos/cosmos-sdk/pull/12702) Linting and tidiness, fixed two minor security warnings. 
 * [#12634](https://github.com/cosmos/cosmos-sdk/pull/12634) Move `sdk.Dec` to math package.
 * [#12596](https://github.com/cosmos/cosmos-sdk/pull/12596) Remove all imports of the non-existent gogo/protobuf v1.3.3 to ease downstream use and go workspaces. 
@@ -309,7 +310,6 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (deps) Downgrade to Tendermint [v0.34.20-rc0](https://github.com/tendermint/tendermint/releases/tag/v0.34.20-rc0).
 * [#12089](https://github.com/cosmos/cosmos-sdk/pull/12089) Mark the `TipDecorator` as beta, don't include it in simapp by default.
 * [#12153](https://github.com/cosmos/cosmos-sdk/pull/12153) Add a new `NewSimulationManagerFromAppModules` constructor, to simplify simulation wiring.
-* (x/bank) [#12674](https://github.com/cosmos/cosmos-sdk/pull/12674) Add convenience function `CreatePrefixedAccountStoreKey()` to construct key to access account's balance for a given denom.
 
 ### Bug Fixes
 

CONTRIBUTING.md

@@ -109,7 +109,7 @@ Then:
    Draft PRs also helps the core team provide early feedback and ensure the work is in the right direction.
 2. When the code is complete, change your PR from `Draft` to `Ready for Review`.
 3. Go through the actions for each checkbox present in the PR template description. The PR actions are automatically provided for each new PR.
-4. Be sure to include a relevant changelog entry in the `Unreleased` section of `CHANGELOG.md` (see file for log format).
+4. Be sure to include a relevant changelog entry in the `Unreleased` section of `CHANGELOG.md` (see file for log format). The entry should be on top of all others changes in the section.
 
 PRs must have a category prefix that is based on the type of changes being made (for example, `fix`, `feat`,
 `refactor`, `docs`, and so on). The *type* must be included in the PR title as a prefix (for example,