chore: added cascade delete sections in Has One and Has Many data model relationships

Author: tejas2008

Diff for: src/pages/[platform]/build-a-backend/data/data-modeling/relationships/index.mdx

@@ -439,6 +439,29 @@ do {
 
 </InlineFilter>
 
+### Handling orphaned foreign keys on parent record deletion in "Has Many" relationship
+
+<InlineFilter filters={["javascript", "angular", "react-native", "react", "nextjs", "vue"]}>
+
+```ts
+// Get the IDs of the related members.
+const { data: teamWithMembers } = await client.models.Team.get(
+  { id: teamId},
+  { selectionSet: ["id", "members.*"] },
+);
+
+// Delete Team
+await client.models.Team.delete({ id: teamWithMembers.id });
+
+// Delete all members in parallel
+await Promise.all(
+  teamWithMembers.members.map(member => 
+  client.models.Member.delete({ id: member.id }) 
+));
+```
+
+</InlineFilter>
+
 ## Model a "one-to-one" relationship
 
 Create a one-to-one relationship between two models using the `hasOne()` and `belongsTo()` methods. In the example below, a **Customer** has a **Cart** and a *Cart* belongs to a **Customer**.
@@ -794,6 +817,26 @@ val cart = Amplify.API.query(
 
 </InlineFilter>
 
+### Handling orphaned foreign keys on parent record deletion in "Has One" relationship
+
+<InlineFilter filters={["javascript", "angular", "react-native", "react", "nextjs", "vue"]}>
+
+```ts
+// Get the customer with their associated cart
+const { data: customerWithCart } = await client.models.Customer.get(
+  { id: customerId },
+  { selectionSet: ["id", "activeCart.*"] },
+);
+
+// Delete Cart if exists
+await client.models.Cart.delete({ id: customerWithCart.activeCart.id });
+
+// Delete the customer
+await client.models.Customer.delete({ id: customerWithCart.id });
+```
+
+</InlineFilter>
+
 
 ## Model a "many-to-many" relationship
 In order to create a many-to-many relationship between two models, you have to create a model that serves as a "join table". This "join table" should contain two one-to-many relationships between the two related entities. For example, to model a **Post** that has many **Tags** and a **Tag** has many **Posts**, you'll need to create a new **PostTag** model that represents the relationship between these two entities.