Add extra example of parentheses in graph queries

src/content/doc-surrealql/statements/relate.mdx

@@ -583,6 +583,76 @@ SELECT
 FROM person:tobie;
 ```
 
+Parentheses can be used at each point of a graph query. The example below includes `person` records (authors) connected to `book` records by the `wrote` table. As both the `person` and `book` tables have fields that can be useful when filtering, they can be isolated with parentheses at this point of the graph query in order to filter using the `WHERE` clause.
+
+```surql
+CREATE person:j_r_r_tolkien SET
+	name = "J.R.R. Tolkien",
+	born = d'1891-01-03';
+-- Very approximate date of birth
+CREATE person:plato SET 
+	name = "Plato", 
+	born = "-0428-06-01";
+
+CREATE book:fotr SET 
+	name = "The Fellowship of the Ring";
+CREATE book:republic SET 
+	name = "The Republic";
+
+RELATE person:j_r_r_tolkien->wrote->book:fotr SET written_at = "North Oxford";
+RELATE person:plato->wrote->book:republic SET written_at = "Athens";
+
+SELECT 
+	name,
+	-- Isolate 'wrote' to use WHERE
+	->(wrote WHERE written_at = "Athens")->book.* AS books_written_in_athens
+FROM person;
+
+SELECT 
+	name, 
+	-- Isolate 'book' to use WHERE
+	->wrote->(book WHERE "Ring" IN name).* AS books_about_rings
+FROM person;
+```
+
+```surql title="Output"
+-------- Query --------
+
+[
+	{
+		books_written_in_athens: [],
+		name: 'J.R.R. Tolkien'
+	},
+	{
+		books_written_in_athens: [
+			{
+				id: book:republic,
+				name: 'The Republic'
+			}
+		],
+		name: 'Plato'
+	}
+]
+
+-------- Query --------
+
+[
+	{
+		books_about_rings: [
+			{
+				id: book:fotr,
+				name: 'The Fellowship of the Ring'
+			}
+		],
+		name: 'J.R.R. Tolkien'
+	},
+	{
+		books_about_rings: [],
+		name: 'Plato'
+	}
+]
+```
+
 ### Bidirectional relation querying
 
 All of the queries up to now have been clear about what sort of record is found at the `in` and `out` fields: `in` is the record that is doing something, while `out` is the record that has something done to it: