style: fix spelling in code comments and strings

graphics/nxterm/nxterm_driver.c

@@ -233,7 +233,7 @@ static ssize_t nxterm_write(FAR struct file *filep, FAR const char *buffer,
 
       do
         {
-          /* Is the character part of a VT100 escape sequnce? */
+          /* Is the character part of a VT100 escape sequence? */
 
           state = nxterm_vt100(priv, ch);
           switch (state)
@@ -312,7 +312,7 @@ static int nxterm_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
 {
   /* NOTE:  We don't need driver context here because the NXTERM handle
    * provided within each of the NXTERM IOCTL command data.  Mutual
-   * exclusion is similar managed by the IOCTL cmmand handler.
+   * exclusion is similar managed by the IOCTL command handler.
    *
    * This permits the IOCTL to be called in abnormal context (such as
    * from boardctl())
@@ -378,7 +378,7 @@ static int nxterm_unlink(FAR struct inode *inode)
  *
  * NOTE:  We don't need driver context here because the NXTERM handle
  * provided within each of the NXTERM IOCTL command data.  Mutual
- * exclusion is similar managed by the IOCTL cmmand handler.
+ * exclusion is similar managed by the IOCTL command handler.
  *
  * This permits the IOCTL to be called in abnormal context (such as
  * from boardctl())

graphics/nxterm/nxterm_font.c

@@ -131,7 +131,7 @@ static void nxterm_fillspace(FAR struct nxterm_state_s *priv,
  *
  * Description:
  *   This is part of the nxterm_putc logic.  It creates and positions a
- *   the character and renders (or re-uses) a glyph for font.
+ *   the character and renders (or reuses) a glyph for font.
  *
  ****************************************************************************/