ResxSourceGenerator: Changed the access modifier of the generated format methods from "internal" to "public" as it is with the generated properties. #7360

…mat methods to "public" Changed the access modifier for format methods from "internal" to "public" like the properties are already. That makes it possible to access those methods from other assemblies too, when the class will be generated as public.

replaced "internal" access modifier for format method with "public"