release-notes: Add back the entry on hedged requests improvements. (#10327)

**What this PR does / why we need it**:
This PR somehow overwrote the entry.
https://github.com/grafana/loki/pull/10286/files

probably some rebase issue.

**Which issue(s) this PR fixes**:
Fixes #<issue number>

**Special notes for your reviewer**:

**Checklist**
- [x] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)

Signed-off-by: Kaviraj <kavirajkanagaraj@gmail.com>

docs/sources/release-notes/next.md

@@ -16,3 +16,4 @@ Grafana Labs is excited to announce the release of Loki ?.?. Here's a summary of
 
 -  **Multi-store Index support**: Loki now supports reading/writing indexes to multiple object stores which enables the use of different storage buckets across periods for storing index. [PR #7754](https://github.com/grafana/loki/pull/7754)], [PR #7447](https://github.com/grafana/loki/pull/7447)
 
+- **Track effectiveness of hedged requests** [PR #10281](https://github.com/grafana/loki/pull/10281)]