Fix a few minor typos

include/nuttx/mutex.h

@@ -75,10 +75,10 @@ extern "C"
  * Name: nxmutex_init
  *
  * Description:
- *   This function initializes the UNAMED mutex. Following a
+ *   This function initializes the UNNAMED mutex. Following a
  *   successful call to nxmutex_init(), the mutex may be used in subsequent
- *   calls to nxmutex_lock(), nxmutex_unlock(), and nxmutex_trylock().  The mutex
- *   remains usable until it is destroyed.
+ *   calls to nxmutex_lock(), nxmutex_unlock(), and nxmutex_trylock().  The
+ *   mutex remains usable until it is destroyed.
  *
  * Parameters:
  *   mutex - Semaphore to be initialized
@@ -99,10 +99,10 @@ static inline int nxmutex_init(FAR mutex_t *mutex)
  * Name: nxmutex_destroy
  *
  * Description:
- *   This function initializes the UNAMED mutex. Following a
+ *   This function initializes the UNNAMED mutex. Following a
  *   successful call to nxmutex_init(), the mutex may be used in subsequent
- *   calls to nxmutex_lock(), nxmutex_unlock(), and nxmutex_trylock().  The mutex
- *   remains usable until it is destroyed.
+ *   calls to nxmutex_lock(), nxmutex_unlock(), and nxmutex_trylock().  The
+ *   mutex remains usable until it is destroyed.
  *
  * Parameters:
  *   mutex - Semaphore to be destroyed

include/nuttx/semaphore.h

@@ -144,7 +144,7 @@ extern "C"
  * Name: nxsem_init
  *
  * Description:
- *   This function initializes the UNAMED semaphore sem. Following a
+ *   This function initializes the UNNAMED semaphore sem. Following a
  *   successful call to nxsem_init(), the semaphore may be used in subsequent
  *   calls to nxsem_wait(), nxsem_post(), and nxsem_trywait().  The semaphore
  *   remains usable until it is destroyed.
@@ -451,7 +451,7 @@ int sem_getprotocol(FAR sem_t *sem, FAR int *protocol);
  * Description:
  *    Set semaphore protocol attribute.
  *
- *    One particularly important use of this furnction is when a semaphore
+ *    One particularly important use of this function is when a semaphore
  *    is used for inter-task communication like:
  *
  *      TASK A                 TASK B

include/nuttx/video/vnc.h

@@ -104,8 +104,8 @@ extern "C"
  *   function.  It is optional becuase it need not be called.  If it is not
  *   called, however, keyboard/mouse inputs from the remote VNC client will
  *   be lost.  By calling vnc_fbinitialize(), you can provide callout
- *   functions that can be received by logic higher in the architure.  This
- *   higher level level callouts can then call nx_kbdin() or nx_mousein() on
+ *   functions that can be received by logic higher in the architecture.
+ *   These higher level callouts can then call nx_kbdin() or nx_mousein() on
  *   behalf of the VNC server.
  *
  *   See also vnc_default_fbinitialize() below.