fixed some typos

Author: luhuadong

components/net/at/at_socket/at_socket.c

@@ -744,7 +744,7 @@ int at_recvfrom(int socket, void *mem, size_t len, int flags, struct sockaddr *f
         goto __exit;
     }
 
-    /* if the socket type is UDP, nead to connect socket first */
+    /* if the socket type is UDP, need to connect socket first */
     if (from && sock->type == AT_SOCKET_UDP && sock->state == AT_SOCKET_OPEN)
     {
         ip_addr_t remote_addr;

components/net/netdev/src/netdev.c

@@ -1087,7 +1087,7 @@ int netdev_cmd_ping(char* target_name, rt_uint32_t times, rt_size_t size)
             }
         }
 
-        /* if the response time is more than NETDEV_PING_DELAY, no nead to delay */
+        /* if the response time is more than NETDEV_PING_DELAY, no need to delay */
         delay_tick = ((rt_tick_get() - start_tick) > NETDEV_PING_DELAY) || (index == times) ? 0 : NETDEV_PING_DELAY;
         rt_thread_delay(delay_tick);
     }

components/net/sal_socket/src/sal_socket.c

@@ -679,7 +679,7 @@ int sal_shutdown(int socket, int how)
     /* get the socket object by socket descriptor */
     SAL_SOCKET_OBJ_GET(sock, socket);
 
-    /* shutdown operation not nead to check network interface status */
+    /* shutdown operation not need to check network interface status */
     /* check the network interface socket opreation */
     SAL_NETDEV_SOCKETOPS_VALID(sock->netdev, pf, shutdown);
 
@@ -970,7 +970,7 @@ int sal_closesocket(int socket)
     /* get the socket object by socket descriptor */
     SAL_SOCKET_OBJ_GET(sock, socket);
 
-    /* clsoesocket operation not nead to vaild network interface status */
+    /* clsoesocket operation not need to vaild network interface status */
     /* valid the network interface socket opreation */
     SAL_NETDEV_SOCKETOPS_VALID(sock->netdev, pf, socket);