Improve Elasticsearch serverless APIs docs landing page

serverless/pages/apis-http-apis.asciidoc

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-* <<elasticsearch-api-conventions>>: The {es-serverless} REST APIs have conventions for headers and request bodies.
-* <<elasticsearch-kibana-api-conventions>>: The Management APIs for {serverless-short} have request header conventions.
-* https://www.elastic.co/docs/api/[API Reference]: Explore the reference information for Elastic Serverless REST APIs
+[discrete]
+[[elasticsearch-api-references-links]]
+== API references
+
+The following APIs are available for {es-serverless} users.
+These links will take you to the autogenerated API reference documentation.
+
+https://www.elastic.co/docs/api/doc/elasticsearch-serverless[Elasticsearch Serverless APIs →]::
+Use these APIs to index, manage, search, and analyze your data in {es-serverless}.
+
+https://www.elastic.co/docs/api/doc/serverless[Kibana Serverless APIs →]::
+Use these APIs to manage resources such as connectors, data views, and saved objects for your {serverless-full} project.
+
+https://www.elastic.co/docs/api/doc/elastic-cloud-serverless[{serverless-full} APIs →]::
+Use these APIs to manage your {serverless-full} projects.
+
+[discrete]
+[[additional-api-details]]
+== Additional API information
+
+<<elasticsearch-api-conventions>>::
+Reference information about headers and request body conventions for {es-serverless} REST APIs.
+
+<<elasticsearch-kibana-api-conventions>>::
+Reference information about request header conventions for {serverless-full} REST APIs.