docs: add note about expanding nested relations (#7008)

www/apps/docs/content/development/entities/repositories.md

@@ -211,6 +211,8 @@ To retrieve a list of records of an entity, use the `find` method:
 const posts = await postRepository.find()
 ```
 
+#### Pass Filters
+
 You can also filter the retrieved items by passing an object of type [FindOption](https://typeorm.io/find-options) as a first parameter:
 
 ```ts
@@ -221,6 +223,8 @@ const posts = await postRepository.find({
 })
 ```
 
+#### Configure Pagination
+
 In addition, you can pass `skip` and `take` properties to the object for pagination purposes. `skip`'s value is a number that indicates how many items to skip before retrieving the results, and `take` indicates how many items to return:
 
 ```ts
@@ -230,6 +234,8 @@ const posts = await postRepository.find({
 })
 ```
 
+#### Expand Relations
+
 To expand relations and retrieve them as part of each item in the result, you can pass the `relations` property to the parameter object:
 
 ```ts
@@ -238,6 +244,16 @@ const posts = await postRepository.find({
 })
 ```
 
+To expand nested relations (a relation of another relation), use dot notation:
+
+```ts
+const posts = await postRepository.find({
+  relations: ["authors.posts"],
+})
+```
+
+#### buildQuery Utility Method
+
 Medusa provides a utility method `buildQuery` that allows you to easily format the object to pass to the `find` method. `buildQuery` accepts two parameters:
 
 1. The first parameter is an object whose keys are the attributes of the entity, and their values are the value to filter by.