Fixes CODEOWNERS by putting all on a single line. Updated Emeritus for MAINTAINERS. (#48)

Signed-off-by: David Venable <dlv@amazon.com>

Author: dlvenable

.github/CODEOWNERS

@@ -1,5 +1,2 @@
 # This should match the list of maintainers in MAINTAINERS.md
-* @asifsmohammed
-* @sshivanii
-* @dlvenable
-* @oeyh
+* @asifsmohammed @dlvenable @oeyh

MAINTAINERS.md

@@ -7,7 +7,6 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Maintainer             | GitHub ID                                             | Affiliation |
 | ---------------------- | ----------------------------------------------------- | ----------- |
 | Asif Sohail Mohammed | [asifsmohammed](https://github.com/asifsmohammed)     | Amazon      |
-| Shivani Shukla       | [sshivanii](https://github.com/sshivanii)             | Amazon      |
 | David Venable        | [dlvenable](https://github.com/dlvenable)             | Amazon      |
 | Hai Yan              | [oeyh](https://github.com/oeyh)                       | Amazon      |
 
@@ -16,5 +15,6 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 
 | Maintainer             | GitHub ID                                             | Affiliation |
 | ---------------------- | ----------------------------------------------------- | ----------- |
+| Shivani Shukla       | [sshivanii](https://github.com/sshivanii)             | Amazon      |
 | Naveen Tatikonda       | [naveentatikonda](https://github.com/naveentatikonda) | Amazon      |
 | Vamshi Vijay Nakkirtha | [vamshin](https://github.com/vamshin)                 | Amazon      |