DOCSP-37056 eloquent relationships (#2747)

* DOCSP-37056: Eloquent relationships

Author: Chris Cho

docs/eloquent-models.txt

@@ -12,19 +12,23 @@ Eloquent Models
    :keywords: php framework, odm
 
 Eloquent models are part of the Laravel Eloquent object-relational
-mapping (ORM) framework that enable you to work with a database by using
-model classes. {+odm-short+} extends this framework to use similar
-syntax to work with MongoDB as a database.
+mapping (ORM) framework, which lets you to work with data in a relational
+database by using model classes and Eloquent syntax. {+odm-short+} extends
+this framework so that you can use Eloquent syntax to work with data in a
+MongoDB database.
 
 This section contains guidance on how to use Eloquent models in
 {+odm-short+} to work with MongoDB in the following ways:
 
 - :ref:`laravel-eloquent-model-class` shows how to define models and customize
   their behavior
+- :ref:`laravel-eloquent-model-relationships` shows how to define relationships
+  between models
 - :ref:`laravel-schema-builder` shows how to manage indexes on your MongoDB
   collections by using Laravel migrations
 
 .. toctree::
 
    /eloquent-models/model-class/
+   Relationships </eloquent-models/relationships>
    Schema Builder </eloquent-models/schema-builder>