Add bit on deletion behaviour

src/content/doc-surrealdb/reference-guide/graph_relations.mdx

@@ -151,12 +151,13 @@ If your use case involves bidirectional links, consider the following items to m
 Record links are preferred if:
 
 * Performance is of the utmost importance.
+* You don't need to put complex queries together.
+* You want to specify in the schema what behaviour should take place when a linked record is deleted (cascade delete, refuse to delete, ignore, etc.).
 
 Graph links are preferred if:
 
 * You want to create links without touching the database schema.
 * You want to put together complex queries that take advantage of SurrealQL's expressive arrow syntax, like `->wrote->comment<-wrote<-person->wrote->comment FROM person`.
-* You want to 
 
 Finally, graph links are not just preferred but almost certainly necessary if you need to keep metadata about the context in which a link is created. Take the following metadata for the examples above involving a user and its comments which contains information about a user's current location, operating system, and mood. Where does this data belong?
 
@@ -823,4 +824,23 @@ For more details on SurrealDB's recursive syntax, see the following pages:
 
 ### When links are deleted
 
-Mention how graph tables are deleted if the records involved are deleted, while record links have the fancy clauses
+As mentioned above, record links since version 2.2.0 have the ability to specify what behaviour should take place when a referencing link is deleted. Graph links have a simpler behaviour in which they will be deleted if at least of the linked records is deleted.
+
+```surql
+-- likes record created without problems
+RELATE person:one->likes->person:two;
+CREATE person:one, person:two;
+DELETE person:one;
+-- 'likes' record is now gone
+SELECT * FROM likes;
+```
+
+A record link allows for more complex behaviour such as the following in which a linked record is removed from the `comments` field if it is deleted, but also adds the record ID to a field called `deleted_comments` for record keeping. For more information on these `ON DELETE` clauses, see the [page on record references](/docs/surrealql/datamodel/references/).
+
+```surql
+DEFINE FIELD comments ON person TYPE option<array<record<comment>>> REFERENCE ON DELETE THEN {
+    UPDATE $this SET
+        deleted_comments += $reference,
+        comments -= $reference;
+};
+```