update description of the procedure db.schema.visualization (#410) (#1148)

Co-authored-by: Nadja Müller <[email protected]>

Author: renetapopova

modules/ROOT/pages/reference/procedures.adoc

@@ -1316,7 +1316,10 @@ For more information, see the link:{neo4j-docs-base-uri}/cypher-manual/{page-ver
 |===
 | Description
 a|
-Visualize the schema of the data.
+Visualizes the schema of the data based on available statistics. A new node is returned for each label.
+The properties represented on the node include `name` (label name), `indexes` (list of indexes), and `constraints` (list of constraints).
+A relationship of a given type is returned for all possible combinations of start and end nodes.
+Note that this may include additional relationships that do not exist in the data due to the information available in the count store.
 | Signature
 m|db.schema.visualization() :: (nodes :: LIST<NODE>, relationships :: LIST<RELATIONSHIP>)
 | Mode