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

opensearch-project#3180)

Signed-off-by: dblock <dblock@amazon.com>

Signed-off-by: dblock <dblock@amazon.com>
Co-authored-by: Qingyang(Abby) Hu <abigailhu2000@gmail.com>
Signed-off-by: Arpit Bandejiya <abandeji@amazon.com>

MAINTAINERS.md

@@ -1,13 +1,16 @@
-# OpenSearch-Dashboards 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
 
-## Maintainers
 | Maintainer                | GitHub ID                                           | Affiliation |
 | ------------------------- | --------------------------------------------------- | ----------- |
 | Anan Zhuang               | [ananzh](https://github.com/ananzh)                 | Amazon      |
 | Bishoy Boktor             | [boktorbb](https://github.com/boktorbb)             | Amazon      |
 | Mihir Soni                | [mihirsoni](https://github.com/mihirsoni)           | Amazon      |
 | Kawika (Rocky) Avilla     | [kavilla](https://github.com/kavilla)               | Amazon      |
-| Sean Neumann              | [seanneumann](https://github.com/seanneumann)       | Amazon      | 
+| Sean Neumann              | [seanneumann](https://github.com/seanneumann)       | Amazon      |
 | Miki Barahmand            | [AMoo-Miki](https://github.com/AMoo-Miki)           | Amazon      |
 | Ashwin P Chandran         | [ashwin-pc](https://github.com/ashwin-pc)           | Amazon      |
 | Josh Romero               | [joshuarrrr](https://github.com/joshuarrrr)         | Amazon      |
@@ -19,8 +22,6 @@
 
 ## Emeritus
 
-| Maintainer                | GitHub ID                                           | Affiliation |
-| ------------------------- | --------------------------------------------------- | ----------- |
-| Tommy Markley             | [tmarkley](https://github.com/tmarkley)             | Amazon      | 
-
-[This document](https://github.com/opensearch-project/.github/blob/main/MAINTAINERS.md) explains what maintainers do, and how they should be doing it. If you're interested in contributing, see [CONTRIBUTING](CONTRIBUTING.md).
+| Maintainer    | GitHub ID                               | Affiliation |
+| ------------- | --------------------------------------- | ----------- |
+| Tommy Markley | [tmarkley](https://github.com/tmarkley) | Amazon      |