Fix code example in timers.h (#412)
Fix code example in timers.h (#412)

The example was trying to create a timer with period 0 which is not a
valid period.

This was reported here - https://forums.freertos.org/t/multiple-timers/13884

Signed-off-by: Gaurav Aggarwal <d1bf49c91a2534b91ae70bd4037813434c35a59c@amazon.com>
FreeRTOS/FreeRTOS-Kernel,FreeRTOS/FreeRTOS-Kernel