kernel: Adjust documentation and revert reporting of all image deletions.

This only happens on team exit and exec. In the exec case, we can
just document that this implies all images are removed from the team.
It appears all consumers of the debugger API handle this correctly as-is.

headers/os/kernel/debugger.h

@@ -193,6 +193,7 @@ typedef enum {
 											// one
 	B_DEBUGGER_MESSAGE_TEAM_DELETED,		// the debugged team is gone
 	B_DEBUGGER_MESSAGE_TEAM_EXEC,			// the debugged team executes exec()
+											// (implies all images have been deleted)
 	B_DEBUGGER_MESSAGE_THREAD_CREATED,		// a thread has been created
 	B_DEBUGGER_MESSAGE_THREAD_DELETED,		// a thread has been deleted
 	B_DEBUGGER_MESSAGE_IMAGE_CREATED,		// an image has been created

src/system/kernel/image.cpp

@@ -227,8 +227,6 @@ remove_images(Team *team)
 
 	while ((image = (struct image*)list_remove_head_item(&images))
 			!= NULL) {
-		user_debug_image_deleted(&image->info.basic_info);
-		sNotificationService.Notify(IMAGE_REMOVED, image);
 		free(image);
 	}