Refresh modules + plus minor clean-up from previous commits

TODO

@@ -31,7 +31,7 @@ nuttx/
 apps/
 
   (3)  Network Utilities (apps/netutils/)
-  (3)  NuttShell (NSH) (apps/nshlib)
+  (2)  NuttShell (NSH) (apps/nshlib)
   (1)  System libraries apps/system (apps/system)
   (4)  Other Applications & Tests (apps/examples/)
 
@@ -1758,12 +1758,6 @@ o NuttShell (NSH) (apps/nshlib)
   Status:      Open
   Priority:    Low
 
-  Title:       ARP COMMAND
-  Description: Add an ARP command so that we can see and modify the contents of
-               the ARP table.
-  Status:      Open
-  Priority:    Low (enhancement)
-
   Title:       ARPPING COMMAND
   Description: Add an arping command
   Status:      Open

libc/net/lib_inetntoa.c

@@ -54,7 +54,7 @@
  * Name: inet_ntoa
  *
  * Description:
- *   The inet_ntoa() function converts the Internet host address in given in
+ *   The inet_ntoa() function converts the Internet host address given in
  *   network byte order to a string in standard numbers-and-dots notation.
  *   The string is returned in a statically allocated buffer, which subsequent
  *   calls will overwrite.

net/netdev/netdev_ioctl.c

@@ -676,13 +676,6 @@ static int netdev_ifrioctl(FAR struct socket *psock, int cmd,
         }
         break;
 
-#ifdef CONFIG_NET_ARPIOCTLS
-      case SIOCSARP:  /* Set a ARP mapping */
-      case SIOCDARP:  /* Delete an ARP mapping */
-      case SIOCGARP:  /* Get an ARP mapping */
-# error "IOCTL Commands not implemented"
-#endif
-
 #ifdef CONFIG_NETDEV_PHY_IOCTL
 #ifdef CONFIG_ARCH_PHY_INTERRUPT
       case SIOCMIINOTIFY: /* Set up for PHY event notifications */