community[patch]: docstrings (#16810)

- added missed docstrings
- formated docstrings to the consistent form

libs/community/langchain_community/storage/astradb.py

@@ -25,6 +25,8 @@ V = TypeVar("V")
 
 
 class AstraDBBaseStore(Generic[V], BaseStore[str, V], ABC):
+    """Base class for the DataStax AstraDB data store."""
+
     def __init__(
         self,
         collection_name: str,
@@ -79,6 +81,7 @@ class AstraDBBaseStore(Generic[V], BaseStore[str, V], ABC):
 
 class AstraDBStore(AstraDBBaseStore[Any]):
     """BaseStore implementation using DataStax AstraDB as the underlying store.
+
     The value type can be any type serializable by json.dumps.
     Can be used to store embeddings with the CacheBackedEmbeddings.
     Documents in the AstraDB collection will have the format
@@ -97,6 +100,7 @@ class AstraDBStore(AstraDBBaseStore[Any]):
 
 class AstraDBByteStore(AstraDBBaseStore[bytes], ByteStore):
     """ByteStore implementation using DataStax AstraDB as the underlying store.
+
     The bytes values are converted to base64 encoded strings
     Documents in the AstraDB collection will have the format
     {