9842 man page typos and spelling

@@ -284,11 +284,11 @@
 \fBpthread_mutex_setprioceiling()\fR    \fB-\fR \fB-\fR
 \fBpthread_mutex_getprioceiling()\fR    \fB-\fR \fB-\fR
 \fBpthread_mutex_lock()\fR      \fBmutex_lock()\fR      \fBmtx_lock()\fR
 \fBpthread_mutex_timedlock()\fR \fB-\fR \fBmtx_timedlock()\fR
 \fBpthread_mutex_trylock()\fR   \fBmutex_trylock()\fR   \fBmtx_trylock()\fR
-\fBpthread_mutex_unlock()\fR    \fBmutex_unlock()\fR    \fBmtx_unlcok()\fR
+\fBpthread_mutex_unlock()\fR    \fBmutex_unlock()\fR    \fBmtx_unlock()\fR
 \fBpthread_mutex_destroy()\fR   \fBmutex_destroy()\fR   \fBmtx_destroy()\fR
 .TE
 
 .SS "Functions Related to Condition Variables"