Update dx.md

Author: oblomov-dev

docs/advanced/technical/dx.md

@@ -6,13 +6,11 @@ hello world small app
 
 ```abap
 CLASS zcl_app_adt DEFINITION PUBLIC CREATE PUBLIC.
-
   PUBLIC SECTION.
     INTERFACES if_oo_adt_classrun.
 
 ENDCLASS.
 
-
 CLASS zcl_app_adt IMPLEMENTATION.
 
   METHOD if_oo_adt_classrun~main.
@@ -24,13 +22,11 @@ ENDCLASS.
 
 ```abap
 CLASS zcl_app_ui5 DEFINITION PUBLIC CREATE PUBLIC .
-
   PUBLIC SECTION.
     INTERFACES z2ui5_if_app.
 
 ENDCLASS.
 
-
 CLASS zcl_app_ui5 IMPLEMENTATION.
 
   METHOD z2ui5_if_app~main.