STM32L0 remove non-UTF characters

Author: jeromecoutant

targets/TARGET_STM/TARGET_STM32L0/STM32Cube_FW/STM32L0xx_HAL_Driver/stm32l0xx_hal_wwdg.c

@@ -40,7 +40,7 @@
         (++) max time (mS) = 1000 * (Counter - 0x40) / WWDG clock
     (+) Typical values:
         (++) Counter min (T[5;0] = 0x00) at 32MHz (PCLK1) with zero prescaler:
-             max timeout before reset: approximately 41.79µs
+             max timeout before reset: approximately 41.79us
         (++) Counter max (T[5;0] = 0x3F) at 32MHz (PCLK1) with prescaler
              dividing by 8:
              max timeout before reset: approximately 342.38ms