[doc] fix docstring typo

python/dgl/graphbolt/internal/sample_utils.py

@@ -187,6 +187,7 @@ def unique_and_compact_csc_formats(
 ):
     """
     Compact csc formats and return unique nodes (per type).
+
     Parameters
     ----------
     csc_formats : Union[CSCFormatBase, Dict(str, CSCFormatBase)]
@@ -203,6 +204,7 @@ def unique_and_compact_csc_formats(
         - If `unique_dst_nodes` is a tensor: It means the graph is homogeneous.
         - If `csc_formats` is a dictionary: The keys are node type and the
         values are corresponding nodes. And IDs inside are heterogeneous ids.
+
     Returns
     -------
     Tuple[csc_formats, unique_nodes]
@@ -211,6 +213,7 @@ def unique_and_compact_csc_formats(
         "Compacted csc formats" indicates that the node IDs in the input node
         pairs are replaced with mapped node IDs, where each type of node is
         mapped to a contiguous space of IDs ranging from 0 to N.
+
     Examples
     --------
     >>> import dgl.graphbolt as gb