astyle shift module documentation to bottom of files

- Astyle chokes on the module description strings, so for now we can keep them near the bottom of each file.

src/drivers/safety_button/SafetyButton.cpp

@@ -199,6 +199,14 @@ SafetyButton::custom_command(int argc, char *argv[])
 	return print_usage("unknown command");
 }
 
+int
+SafetyButton::print_status()
+{
+	PX4_INFO("Safety State (from button): %s", _safety_btn_off ? "off" : "on");
+
+	return 0;
+}
+
 int
 SafetyButton::print_usage(const char *reason)
 {
@@ -219,18 +227,7 @@ This module is responsible for the safety button.
 	return 0;
 }
 
-int
-SafetyButton::print_status()
-{
-	PX4_INFO("Safety State (from button): %s", _safety_btn_off ? "off" : "on");
-
-	return 0;
-}
-
-extern "C" __EXPORT int safety_button_main(int argc, char *argv[]);
-
-int
-safety_button_main(int argc, char *argv[])
+extern "C" __EXPORT int safety_button_main(int argc, char *argv[])
 {
 	return SafetyButton::main(argc, argv);
 }