Marked project_routing as being '@Availability serverless' only

Author: quux00

output/openapi/elasticsearch-openapi.json

@@ -227,8 +227,8 @@ export interface Request extends RequestBase {
      *  _alias:my-project
      *  _alias:_origin
      *  _alias:*pr*
-     * Supported in serverless only. The param is not supported in stateful
-     * (on-prem, ECH, etc.)
+     * Supported in serverless only.
+     * @availability serverless
      */
     project_routing?: ProjectRouting
     /**

output/openapi/elasticsearch-serverless-openapi.json

@@ -134,8 +134,8 @@ export interface Request extends RequestBase {
      *  _alias:my-project
      *  _alias:_origin
      *  _alias:*pr*
-     * Supported in serverless only. The param is not supported in stateful
-     * (on-prem, ECH, etc.)
+     * Supported in serverless only.
+     * @availability serverless
      */
     project_routing?: ProjectRouting
     /** @server_default true */