kernel/sem_wait.c : Add comment about semcount increasing awakened by signal or timeout
kernel/sem_wait.c : Add comment about semcount increasing awakened by signal or timeout

If a semaphore is awakened by signal or timeout, its semcount was increased from sem_waitirq.
In the sem_wait code, there is no mention about semcount restore, so added the description about this.

Signed-off-by: jeongchanKim <dd29dda359f9c9995ad03eb5d0e774929bcceb5c@samsung.com>

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