add release note for 2.2.1 (#2256)

Signed-off-by: Anan Zhuang <ananzh@amazon.com> Signed-off-by: Anan Zhuang <ananzh@amazon.com>
opensearch-project · Sep 1, 2022 · b961263 · b961263
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diff --git a/release-notes/opensearch-dashboards.release-notes-2.2.1.md b/release-notes/opensearch-dashboards.release-notes-2.2.1.md
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+## Version 2.2.1 Release Notes
+
+### 🛠 Maintenance
+* Bump 2.2 branch version to be 2.2.1 ([#2129](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2129))