[Release Notes Appender] Add PR #10047: add volume and volume_range docs (#10074)

Add PR #10047 to release notes for next release

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Co-authored-by: Trevor Whitney <trevorjwhitney@gmail.com>

docs/sources/release-notes/next.md

@@ -17,3 +17,5 @@ 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)]
+
+-  **New volume and volume_range endpoints**: Two new endoints, `index/volume` and `index/volume_range`, have been added to Loki. They return aggregate volume information from the TSDB index for all streams matching a provided stream selector. This feature was introduced via multiple PRs, including [PR #9988](https://github.com/grafana/loki/pull/9988), [PR #9966](https://github.com/grafana/loki/pull/9966), [PR #9833](https://github.com/grafana/loki/pull/9833), [PR #9832](https://github.com/grafana/loki/pull/9832), [PR #9776](https://github.com/grafana/loki/pull/9776), [PR #9762](https://github.com/grafana/loki/pull/9762), [PR #9704](https://github.com/grafana/loki/pull/9704), [PR #10248](https://github.com/grafana/loki/pull/10248), [PR #10099](https://github.com/grafana/loki/pull/10099), [PR #10076](https://github.com/grafana/loki/pull/10076), [PR #10047](https://github.com/grafana/loki/pull/10047) and [PR #10045](https://github.com/grafana/loki/pull/10045)