added note

Author: EdB-MSFT

articles/sentinel/datalake/sentinel-graph-provider-reference.md

@@ -823,6 +823,9 @@ NodeBuilderInitial(alias: str, graph_builder: GraphSpecBuilder)
 
 #### Methods
 
+> [!NOTE]
+> The use of underscores `_` when naming nodes, edges, or properties in a custom graph isn't supported. An invalid request error is returned when underscores are used.
+
 ##### `from_table`
 
 ```python
@@ -1065,6 +1068,9 @@ EdgeBuilderInitial(alias: str, graph_builder: GraphSpecBuilder)
 
 #### Methods
 
+> [!NOTE]
+> The use of underscores `_` when naming nodes, edges, or properties in a custom graph isn't supported. An invalid request error is returned when underscores are used.
+
 ##### `from_table`
 
 ```python
@@ -2485,10 +2491,6 @@ builder.add_node("user") \
     .add_edge("follows")
 ```
 
-### Restrictions
-
-Builder support methods - add_node() and add_edge() does not allow use of underscores ('_') when naming nodes, edges or properties in a custom graph. Graph building operations will fail surfacing an invalid request error.
-
 ### Union Schemas
 
 Multiple edges with the same alias are automatically union'ed with merged properties: