include/pthread.h: fix PTHREAD_COND_INITIALIZER macro and explanation comment for tinyara/semaphore.h
include/pthread.h: fix PTHREAD_COND_INITIALIZER macro and explanation comment for tinyara/semaphore.h

PTHREAD_COND_INITIALIZER will initialize the pthread_cond_s,and pthread_cond_s is made from semaphore
Referenced by Nuttx(35a6ef7)

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