Update API specification

lib/www/server/spec/openapi.yaml

@@ -1036,8 +1036,12 @@ paths:
                                             type: string
                                         schema:
                                             type: string
-                                        meta:
-                                            type: object
+                                            description: The internal namespace for a project used by the backend database.
+                                        groups:
+                                            type: array
+                                            items:
+                                                type: string
+                                            description: Zero or more strings, each representing a *group name*. These are used to group together related projects with the same or similar preplots in order to do temporal comparisons and statistics.
                 "401":
                     $ref: "#/components/responses/401"