Updated MAINTAINERS.md to match recommended opensearch-project format. (#132)

Signed-off-by: dblock <[email protected]>

Signed-off-by: dblock <[email protected]>

Author: dblock

MAINTAINERS.md

@@ -1,4 +1,6 @@
-# OpenSearch Ruby Client Maintainers
+## Overview
+
+This document contains a list of maintainers in this repo. See [opensearch-project/.github/RESPONSIBILITIES.md](https://github.com/opensearch-project/.github/blob/main/RESPONSIBILITIES.md#maintainer-responsibilities) that explains what the role of maintainer means, what maintainers do in this and other repos, and how they should be doing it. If you're interested in contributing, and becoming a maintainer, see [CONTRIBUTING](CONTRIBUTING.md).
 
 ## Current Maintainers
 
@@ -18,7 +20,3 @@
 | Maintainer     | GitHub ID                           | Affiliation |
 | -------------- | ----------------------------------- | ----------- |
 | Yuvraj Jaiswal | [yuvi17](https://github.com/yuvi17) | Amazon      |
-
-[This document](https://github.com/opensearch-project/.github/blob/main/MAINTAINERS.md)
-explains what maintainers do in this repo, and how they should be doing it.
-If you're interested in contributing, see [CONTRIBUTING](CONTRIBUTING.md).