doc: Fix semaphore related function names

Documentation/NuttxUserGuide.html

@@ -3920,7 +3920,7 @@ interface of the same name.
 <pre>
     #include &lt;semaphore.h&gt;
     #include &lt;time.h&gt;
-    int sem_wait(sem_t *sem, const struct timespec *abstime);
+    int sem_timedwait(sem_t *sem, const struct timespec *abstime);
 </pre>
 
 <p>
@@ -3948,7 +3948,7 @@ interface of the same name.
 <li>0 (<code>OK</code>), or -1 (<code>ERROR</code>) is unsuccessful
 </ul>
 <p>
-If <code>sem_wait</code> returns -1 (<code>ERROR</code>) then the cause of the failure
+If <code>sem_timedwait</code> returns -1 (<code>ERROR</code>) then the cause of the failure
 will be indicated by the thread-specific <a href="#ErrnoAccess"><code>errno</code></a>.
 The following lists the possible values for <a href="#ErrnoAccess"><code>errno</code></a>:
 <p>
@@ -4006,7 +4006,7 @@ returns without blocking.
 <ul>
 <li>0 (<code>OK</code>) or -1 (<code>ERROR</code>) if unsuccessful
 </ul>
-If <code>sem_wait</code> returns -1 (<code>ERROR</code>) then the cause of the failure
+If <code>sem_trywait</code> returns -1 (<code>ERROR</code>) then the cause of the failure
 will be indicated by the thread-specific <a href="#ErrnoAccess"><code>errno</code></a>.
 The following lists the possible values for <a href="#ErrnoAccess"><code>errno</code></a>:
 <p>
@@ -4165,7 +4165,7 @@ Otherwise, an -1 (<code>ERROR</code>) will be returned and the <code>errno</code
 <b>Returned Value:</b>
 </p>
 <p>
-If successful, the <code>sem_getprotocol()</code> function will return zero (<code>OK</code>).
+If successful, the <code>sem_setprotocol()</code> function will return zero (<code>OK</code>).
 Otherwise, an -1 (<code>ERROR</code>) will be returned and the <code>errno</code> value will be set to indicate the nature of the error.
 </p>
 <p>