[Release Notes Appender] Add PR #8646: Optimize .+ regex line filter (#10286)

Add PR #8646 to release notes for next release

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Co-authored-by: Travis Patterson <travis.patterson@grafana.com>

docs/sources/release-notes/next.md

@@ -1,16 +1,15 @@
----
-title: V?.?
-description: Version ?.? release notes
-weight: 100000
-draft: true
----
-
-# V?.?
-Grafana Labs is excited to announce the release of Loki ?.?. Here's a summary of new enhancements and important fixes:
-
-:warning: This a placeholder for the next release. Clean up all features listed below
-
-## Features and enhancements
-
--  **Track effectiveness of hedged requests** [PR #10281](https://github.com/grafana/loki/pull/10281)]
-
+---
+title: V?.?
+description: Version ?.? release notes
+weight: 100000
+draft: true
+---
+
+# V?.?
+Grafana Labs is excited to announce the release of Loki ?.?. Here's a summary of new enhancements and important fixes:
+
+:warning: This a placeholder for the next release. Clean up all features listed below
+
+## Features and enhancements
+
+-  **Query Language Improvements**: Several improvements to the query language that speed up line parsing and regex matching. [PR #8646](https://github.com/grafana/loki/pull/8646), [PR #8659](https://github.com/grafana/loki/pull/8659), [PR #8724](https://github.com/grafana/loki/pull/8724), [PR #8734](https://github.com/grafana/loki/pull/8734), [PR #8739](https://github.com/grafana/loki/pull/8739), [PR #8763](https://github.com/grafana/loki/pull/8763), [PR #8890](https://github.com/grafana/loki/pull/8890),[PR #8914](https://github.com/grafana/loki/pull/8914)