9842 man page typos and spelling

*** 220,230 ****
         pthread_mutex_setprioceiling()       -                 -
         pthread_mutex_getprioceiling()       -                 -
         pthread_mutex_lock()                 mutex_lock()      mtx_lock()
         pthread_mutex_timedlock()            -                 mtx_timedlock()
         pthread_mutex_trylock()              mutex_trylock()   mtx_trylock()
!        pthread_mutex_unlock()               mutex_unlock()    mtx_unlcok()
         pthread_mutex_destroy()              mutex_destroy()   mtx_destroy()
  
  
     Functions Related to Condition Variables
  
--- 220,230 ----
         pthread_mutex_setprioceiling()       -                 -
         pthread_mutex_getprioceiling()       -                 -
         pthread_mutex_lock()                 mutex_lock()      mtx_lock()
         pthread_mutex_timedlock()            -                 mtx_timedlock()
         pthread_mutex_trylock()              mutex_trylock()   mtx_trylock()
!        pthread_mutex_unlock()               mutex_unlock()    mtx_unlock()
         pthread_mutex_destroy()              mutex_destroy()   mtx_destroy()
  
  
     Functions Related to Condition Variables