feat: update readme

Author: bitfl0wer

README.md

@@ -6,7 +6,7 @@
 [![Build/Deploy OpenAPI specification](https://github.com/polyphony-chat/docs/actions/workflows/deploy-openapi-spec.yml/badge.svg)](https://github.com/polyphony-chat/docs/actions/workflows/deploy-openapi-spec.yml)
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-Specification documents and API documentation for polyproto.
+Specification documents and API documentation for `polyproto`, `polyproto-chat` and `polyproto-mls`.
 
 API documentation built with [TypeSpec](https://typespec.io).