wording fixes for AR docs

docs/api/db/ActiveRecord-find.md

 The returned [[ActiveQuery]] instance can be further customized by calling
-methods defined in [[ActiveQuery]] before returning the populated active records.
-
-Below are some examples:
+methods defined in [[ActiveQuery]] before `one()`, `all()` or `value()` is
+called to return the populated active records:
 
 ~~~
 // find all customers
 $customers = Customer::find()->all();
+
 // find all active customers and order them by their age:
 $customers = Customer::find()
     ->where(array('status' => 1))
     ->orderBy('age')
     ->all();
+
 // find a single customer whose primary key value is 10
 $customer = Customer::find(10);
+
 // the above is equivalent to:
 $customer = Customer::find()->where(array('id' => 10))->one();
+
 // find a single customer whose age is 30 and whose status is 1
 $customer = Customer::find(array('age' => 30, 'status' => 1));
+
 // the above is equivalent to:
 $customer = Customer::find()->where(array('age' => 30, 'status' => 1))->one();
 ~~~
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