Fix typos using codespell

Conservative strategy was used, maybe other typos remain.

Rebased: Simon Goldschmidt <goldsimon@gmx.de>

contrib/ports/unix/README

@@ -1,5 +1,5 @@
 This port contains infrastructure and examples for running lwIP on Unix-like
-operating systems (Linux, OpenBSD, cygwin). Much of this is targetted towards
+operating systems (Linux, OpenBSD, cygwin). Much of this is targeted towards
 testing lwIP applications.
 
 * port/sys_arch.c, port/perf.c, port/include/arch/: Generic platform porting,

contrib/ports/unix/lib/lwipopts.h

@@ -357,7 +357,7 @@
 
 /**
  * PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. The default is
- * designed to accomodate single full size TCP frame in one pbuf, including
+ * designed to accommodate single full size TCP frame in one pbuf, including
  * TCP_MSS, IP header, and link header.
 *
  */

contrib/ports/unix/port/include/netif/fifo.h

@@ -15,7 +15,7 @@ typedef struct fifo_t {
 
   sys_sem_t sem;		/* semaphore protecting simultaneous data manipulation */
   sys_sem_t getSem;		/* sepaphore used to signal new data if getWaiting is set */
-  u8_t getWaiting;		/* flag used to indicate that fifoget is waiting for data. fifoput is suposed to clear */
+  u8_t getWaiting;		/* flag used to indicate that fifoget is waiting for data. fifoput is supposed to clear */
   						/* this flag prior to signaling the getSem semaphore */
 } fifo_t;
 

contrib/ports/unix/port/include/netif/sio.h

@@ -29,7 +29,7 @@ typedef enum sioBaudrates {
 s16_t sio_poll(sio_status_t * siostat);
 
 /**
-*	Parse incoming characters until a string str is recieved, blocking call
+*	Parse incoming characters until a string str is received, blocking call
 * @param	str		zero terminated string to expect
 * @param 	siostat siostatus struct, contains sio instance data, given by sio_open
 */

contrib/ports/win32/pcapif.c

@@ -172,7 +172,7 @@ struct pcapipf_pending_packet {
 };
 #endif /* PCAPIF_RECEIVE_PROMISCUOUS */
 
-/* Packet Adapter informations */
+/* Packet Adapter information */
 struct pcapif_private {
   void            *input_fn_arg;
   pcap_t          *adapter;