minor doc fix.

docs/guide/active-record.md

@@ -175,7 +175,9 @@ $customer->delete();
 Customer::updateAllCounters(array('age' => 1));
 ```
 
-Notice that you can always use the `save` method, and ActiveRecord will automatically perform an INSERT for new records and an UPDATE for existing ones.
+> Info: The `save()` method will either perform an `INSERT` or `UPDATE` SQL statement, depending
+  on whether the ActiveRecord being saved is new or not by checking `ActiveRecord::isNewRecord`.
+
 
 Data Input and Validation
 -------------------------

docs/guide/validation.md

@@ -38,7 +38,7 @@ Compares the specified attribute value with another value and validates if they
 
 Verifies if the attribute represents a date, time or datetime in a proper format.
 
-- `format` the date format that the value being validated should follow accodring to [[http://www.php.net/manual/en/datetime.createfromformat.php]]. _('Y-m-d')_
+- `format` the date format that the value being validated should follow according to [[http://www.php.net/manual/en/datetime.createfromformat.php]]. _('Y-m-d')_
 - `timestampAttribute` the name of the attribute to receive the parsing result.
 
 ### `default`: [[DefaultValueValidator]]