Update fondant_component.yaml (#647)

minor detail: set n_rows_to_load default value to None to be able to
easily load the whole parquet file

components/load_from_parquet/fondant_component.yaml

@@ -21,7 +21,8 @@ args:
   n_rows_to_load:
     description: Optional argument that defines the number of rows to load. Useful for testing pipeline runs on a small scale
     type: int
+    default: None
   index_column:
     description: Column to set index to in the load component, if not specified a default globally unique index will be set
     type: str
-    default: None
+    default: None