NumberBox: update format (#7050)

api-reference/10 UI Components/dxNumberBox/1 Configuration/format.md

@@ -120,7 +120,9 @@ The format property can accept the following value types:
 
 
 - Function    
-A function should apply a custom format to a value and return the formatted value as a string. Functions are useful for advanced formatting. Refer to the following article for more information: [Custom Function](/concepts/Common/Value%20Formatting/10%20Format%20UI%20Component%20Values/30%20Custom%20Function.md '/Documentation/Guide/Common/Value_Formatting/#Format_UI_Component_Values/Custom_Function').
+A function should apply a custom format to a value and return the formatted value as a string. A shortcut for the [formatter](/api-reference/50%20Common/Object%20Structures/format/formatter.md '/Documentation/ApiReference/Common/Object_Structures/Format/#formatter') property. Refer to the following article for more information: [Custom Function](/concepts/Common/Value%20Formatting/10%20Format%20UI%20Component%20Values/30%20Custom%20Function.md '/Documentation/Guide/Common/Value_Formatting/#Format_UI_Component_Values/Custom_Function').
+
+    [important] If you allow users to edit the formatted value, implement the [parser](/api-reference/50%20Common/Object%20Structures/format/parser.md '/Documentation/ApiReference/Common/Object_Structures/format/#parser') function to convert the value back to a number.
 
 - Object    
 Full format configuration. The object structure is shown in the [format](/api-reference/50%20Common/Object%20Structures/format '/Documentation/ApiReference/Common/Object_Structures/format/') API section.