Remove unnecessary blank lines in hello_world.md

Author: oblomov-dev

docs/get_started/hello_world.md

@@ -68,12 +68,10 @@ CLASS z2ui5_cl_app_hello_world IMPLEMENTATION.
           )->button( text = `post` press = client->_event( `POST` ) ).
         client->view_display( view->stringify( ) ).
 
-
       WHEN client->check_on_event( `POST` ).
 
         client->message_box_display( `Hello World!` ).
 
-
     ENDCASE.
   ENDMETHOD.
 ENDCLASS.
@@ -103,12 +101,10 @@ CLASS z2ui5_cl_app_hello_world IMPLEMENTATION.
           )->input( client->_bind_edit( name ) ).
         client->view_display( view->stringify( ) ).
 
-
       WHEN client->check_on_event( `POST` ).
 
         client->message_box_display( |Your name is { name }.| ).
 
-
     ENDCASE.
   ENDMETHOD.
 ENDCLASS.