Fix Emeritus Table in MAINTAINERS.md (#3137)

Fixes emeritus table formatting in Maintainers document.

Signed-off-by: Nicholas Walter Knize <nknize@apache.org>
(cherry picked from commit ae4c612)

MAINTAINERS.md

@@ -29,6 +29,7 @@
 ## Emeritus
 
 | Maintainer | GitHub ID | Affiliation |
+| --------------- | --------- | ----------- |
 | Megha Sai Kavikondala | [meghasaik](https://github.com/meghasaik) | 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).