fixed comment syntax

There seems to be a syntax msitake in the comment part of the 'stm32h7xx_hal_timebase_rtc_alarm_template.c' file, which leads to compile failure in keil uVision V5.38.0.0. This patch fix the problem and now it compiles well without error.

Author: hehaorui

Drivers/STM32H7xx_HAL_Driver/Src/stm32h7xx_hal_timebase_rtc_alarm_template.c

@@ -22,8 +22,7 @@
   * If no LICENSE file comes with this software, it is provided AS-IS.
   *
   ******************************************************************************
-  */
- @verbatim
+  @verbatim
   ==============================================================================
                         ##### How to use this driver #####
   ==============================================================================