add jowg-amazon as codeowner (opensearch-project#962)

Signed-off-by: Joanne Wang <[email protected]>

.github/CODEOWNERS

@@ -1 +1 @@
-*   @bowenlan-amzn @getsaurabh02 @lezzago @praveensameneni @xluo-aws @gaobinlong @Hailong-am @amsiglan @sbcd90 @eirsep @AWSHurneyt
+*   @bowenlan-amzn @getsaurabh02 @lezzago @praveensameneni @xluo-aws @gaobinlong @Hailong-am @amsiglan @sbcd90 @eirsep @AWSHurneyt @jowg-amazon

MAINTAINERS.md

@@ -5,7 +5,7 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 ## Current Maintainers
 
 | Maintainer            | GitHub ID                                             | Affiliation |
-| --------------------- | ----------------------------------------------------- | ----------- |
+|-----------------------|-------------------------------------------------------| ----------- |
 | Ashish Agrawal        | [lezzago](https://github.com/lezzago)                 | Amazon      |
 | Bowen Lan             | [bowenlan-amzn](https://github.com/bowenlan-amzn)     | Amazon      |
 | Praveen Sameneni      | [praveensameneni](https://github.com/praveensameneni) | Amazon      |
@@ -17,3 +17,4 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Subhobrata Dey        | [sbcd90](https://github.com/sbcd90)                   | Amazon      |
 | Surya Sashank Nistala | [eirsep](https://github.com/eirsep)                   | Amazon      |
 | Thomas Hurney         | [AWSHurneyt](https://github.com/AWSHurneyt)           | Amazon      |
+| Joanne Wang           | [jowg-amazon](https://github.com/jowg-amazon)         | Amazon      |