Revert "add: configs as json GUC for db-root-spec"

This reverts commit f34ca15e84.

docs/references/api/openapi.rst

@@ -66,34 +66,24 @@ You can override the whole default response with a function result. To do this,
 
    db-root-spec = "root"
 
-When this function is called, the ``request.root.configs`` GUC contains a JSON object with the following keys:
-
-* ``server_host`` (string)
-* ``server_port`` (string)
-* ``openapi_server_proxy_uri`` (string)
-* ``db_schemas`` (JSON array of strings)
-* ``version`` (string)
-
-The root spec function can read this JSON and use its values when constructing the response:
-
 .. code:: postgres
 
   create or replace function root() returns json as $_$
   declare
-  configs json := current_setting('request.root.configs', true)::json;
+  openapi json = $$
+    {
+      "swagger": "2.0",
+      "info":{
+        "title":"Overridden",
+        "description":"This is a my own API"
+      }
+    }
+  $$;
   begin
-    return json_build_object(
-      'swagger', '2.0',
-      'info', json_build_object(
-        'title', 'Overridden',
-        'description', 'This is my own API',
-        'version', configs->>'version'
-      )
-    );
+    return openapi;
   end
   $_$ language plpgsql;
 
-
 .. code-block:: bash
 
   curl http://localhost:3000
@@ -106,7 +96,6 @@ The root spec function can read this JSON and use its values when constructing t
     "swagger": "2.0",
     "info":{
       "title":"Overridden",
-      "description":"This is my own API",
-      "version":"14.0.0"
+      "description":"This is a my own API"
     }
   }