docs: Add docstring for node usage in backend

cognee/api/v1/add/routers/get_add_router.py

@@ -42,6 +42,8 @@ def get_add_router() -> APIRouter:
           - Regular file uploads
         - **datasetName** (Optional[str]): Name of the dataset to add data to
         - **datasetId** (Optional[UUID]): UUID of an already existing dataset
+        - **node_set** Optional[list[str]]: List of node identifiers for graph organization and access control.
+                 Used for grouping related data points in the knowledge graph.
 
         Either datasetName or datasetId must be provided.
 

cognee/api/v1/search/routers/get_search_router.py

@@ -80,6 +80,7 @@ def get_search_router() -> APIRouter:
         - **datasets** (Optional[List[str]]): List of dataset names to search within
         - **dataset_ids** (Optional[List[UUID]]): List of dataset UUIDs to search within
         - **query** (str): The search query string
+        - **node_name** Optional[list[str]]: Filter results to specific node_sets defined in the add pipeline (for targeted search).
         - **top_k** (Optional[int]): Maximum number of results to return (default: 10)
 
         ## Response