🩹 Fix M503 report (#23084)

Marlin/src/gcode/config/M304.cpp

 
 void GcodeSuite::M304_report(const bool forReplay/*=true*/) {
   report_heading_etc(forReplay, F(STR_BED_PID));
-  SERIAL_ECHO_MSG(
+  SERIAL_ECHOLNPGM(
       "  M304 P", thermalManager.temp_bed.pid.Kp
     , " I", unscalePID_i(thermalManager.temp_bed.pid.Ki)
     , " D", unscalePID_d(thermalManager.temp_bed.pid.Kd)

Marlin/src/module/settings.cpp

     //
     CONFIG_ECHO_HEADING("Linear Units");
     #if ENABLED(INCH_MODE_SUPPORT)
-      SERIAL_ECHOPGM("  G2", AS_DIGIT(parser.linear_unit_factor == 1.0), " ;");
+      SERIAL_ECHO_MSG("  G2", AS_DIGIT(parser.linear_unit_factor == 1.0), " ;");
     #else
-      SERIAL_ECHOPGM("  G21 ;");
+      SERIAL_ECHO_MSG("  G21 ;");
     #endif
     gcode.say_units();