minor doc fix.

docs/guide/active-record.md

@@ -133,10 +133,10 @@ $values = $customer->attributes;
 ```
 
 
-Persisting Data to Database
+Saving Data to Database
----------------------------
+-----------------------
 
-ActiveRecord provides the following methods to insert, update and delete data:
+ActiveRecord provides the following methods to insert, update and delete data in the database:
 
 - [[save()]]
 - [[insert()]]
@@ -207,9 +207,9 @@ a one-many relationship. For example, a customer has many orders. And the [[hasO
 method declares a many-one or one-one relationship. For example, an order has one customer.
 Both methods take two parameters:
 
-- `$class`: the name of the class related models should use. If specified without
+- `$class`: the name of the class of the related model(s). If specified without
-  a namespace, the namespace will be taken from the declaring class.
+  a namespace, the namespace of the related model class will be taken from the declaring class.
-- `$link`: the association between columns from two tables. This should be given as an array.
+- `$link`: the association between columns from the two tables. This should be given as an array.
   The keys of the array are the names of the columns from the table associated with `$class`,
   while the values of the array are the names of the columns from the declaring class.
   It is a good practice to define relationships based on table foreign keys.
@@ -263,8 +263,8 @@ class Order extends \yii\db\ActiveRecord
 ```
 
 [[ActiveRelation::via()]] method is similar to [[ActiveRelation::viaTable()]] except that
-the first parameter of [[ActiveRelation::via()]] takes a relation name declared in the ActiveRecord class.
+the first parameter of [[ActiveRelation::via()]] takes a relation name declared in the ActiveRecord class
-For example, the above `items` relation can be equivalently declared as follows:
+instead of the pivot table name. For example, the above `items` relation can be equivalently declared as follows:
 
 ```php
 class Order extends \yii\db\ActiveRecord
@@ -315,7 +315,7 @@ How many SQL queries will be performed in the above code, assuming there are mor
 the database? 101! The first SQL query brings back 100 customers. Then for each customer, a SQL query
 is performed to bring back the customer's orders.
 
-To solve the above performance problem, you can use the so-called *eager loading* by calling [[ActiveQuery::with()]]:
+To solve the above performance problem, you can use the so-called *eager loading* approach by calling [[ActiveQuery::with()]]:
 
 ```php
 // SQL executed: SELECT * FROM tbl_customer LIMIT 100
@@ -473,7 +473,7 @@ TODO: FIXME: WIP, TBD, https://github.com/yiisoft/yii2/issues/226
 
 Imagine situation where you have to save something related to the main model in [[beforeSave()]],
 [[afterSave()]], [[beforeDelete()]] and/or [[afterDelete()]] life cycle methods. Developer may come
-to solution of overriding ActiveRecord [[save()]] method with database transaction wrapping or
+to the solution of overriding ActiveRecord [[save()]] method with database transaction wrapping or
 even using transaction in controller action, which is strictly speaking doesn't seems to be a good
 practice (recall skinny-controller fat-model fundamental rule).