fix: description

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: sangeethailango

plane/models/query_params.py

@@ -139,8 +139,8 @@ class WorkItemCountQueryParams(BaseModel):
         None,
         description=(
             "ORM field to group counts by. When supplied the response shape "
-            "changes from a flat ``{count}`` to a grouped "
-            "``{grouped_by, total_count, results}`` envelope."
+            "changes from a flat ``{total_count}`` to a grouped "
+            "``{grouped_by, sub_grouped_by, total_count, grouped_counts}`` envelope."
         ),
     )