Update MAINTAINERS.md with keep-sorted (#35772)

I am a google employee.

I am submitting this CL from my personal github account only to document how people can submit their code into the grpc repository. Screenshots from this will be used for our documentation.
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Closes #35772

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/35772 from jagtaptanvi:change_to_docs_01 bf910f3635
PiperOrigin-RevId: 604546948

MAINTAINERS.md

@@ -44,6 +44,7 @@ for general contribution guidelines.
 <!-- go/keep-sorted end -->
 
 ## Emeritus Maintainers (in alphabetical order)
+<!-- go/keep-sorted start case=no -->
 - [adelez](https://github.com/adelez), Google LLC
 - [AspirinSJL](https://github.com/AspirinSJL), Google LLC
 - [billfeng327](https://github.com/billfeng327), Google LLC
@@ -90,3 +91,4 @@ for general contribution guidelines.
 - [yihuazhang](https://github.com/yihuazhang), Google LLC
 - [zpencer](https://github.com/zpencer), Google LLC
 - [ZhenLian](https://github.com/ZhenLian), Google LLC
+<!-- go/keep-sorted end -->