Comment, spacing cleanup

Marlin/src/HAL/STM32F1/watchdog.h

@@ -27,11 +27,9 @@
 
 #include <libmaple/iwdg.h>
 
-// Arduino STM32F1 core now has watchdog support
-
-// Initialize watchdog with a 4 second countdown time
+// Initialize watchdog with a 4 or 8 second countdown time
 void watchdog_init();
 
-// Reset watchdog. MUST be called at least every 4 seconds after the
-// first watchdog_init or STM32F1 will reset.
+// Reset watchdog. MUST be called every 4 or 8 seconds after the
+// first watchdog_init or the STM32F1 will reset.
 void HAL_watchdog_refresh();