Fix typos using codespell

Conservative strategy was used, maybe other typos remain.

Rebased: Simon Goldschmidt <goldsimon@gmx.de>

src/include/lwip/apps/httpd_opts.h

@@ -94,7 +94,7 @@
  *
  * To save memory, the maximum tag length is limited (@see LWIP_HTTPD_MAX_TAG_NAME_LEN).
  * To save memory, the maximum insertion string length is limited (@see
- * LWIP_HTTPD_MAX_TAG_INSERT_LEN). If this is not enought, @ref LWIP_HTTPD_SSI_MULTIPART
+ * LWIP_HTTPD_MAX_TAG_INSERT_LEN). If this is not enough, @ref LWIP_HTTPD_SSI_MULTIPART
  * can be used.
  */
 #if !defined LWIP_HTTPD_SSI || defined __DOXYGEN__

src/include/lwip/apps/mdns_priv.h

@@ -143,7 +143,7 @@ struct mdns_outmsg {
   /** If legacy query. (tx_id needed, and write
    *  question again in reply before answer) */
   u8_t legacy_query;
-  /** If the query is a probe msg we need to respond immediatly. Independent of
+  /** If the query is a probe msg we need to respond immediately. Independent of
    *  the QU or QM flag. */
   u8_t probe_query_recv;
   /* Question bitmask for host information */

src/include/lwip/apps/netbiosns_opts.h

@@ -42,7 +42,7 @@
 
 /** NetBIOS name of lwip device
  * This must be uppercase until NETBIOS_STRCMP() is defined to a string
- * comparision function that is case insensitive.
+ * comparison function that is case insensitive.
  * If you want to use the netif's hostname, use this (with LWIP_NETIF_HOSTNAME):
  * (ip_current_netif() != NULL ? ip_current_netif()->hostname != NULL ? ip_current_netif()->hostname : "" : "")
  *

src/include/lwip/apps/snmp.h

@@ -50,7 +50,7 @@ extern "C" {
 #include "lwip/err.h"
 #include "lwip/apps/snmp_core.h"
 
-/** SNMP variable binding descriptor (publically needed for traps) */
+/** SNMP variable binding descriptor (publicly needed for traps) */
 struct snmp_varbind
 {
   /** pointer to next varbind, NULL for last in list */

src/include/lwip/apps/snmp_mib2.h

@@ -60,7 +60,7 @@ extern struct snmp_threadsync_instance snmp_mib2_lwip_locks;
 #define SNMP_SYSSERVICES ((1 << 6) | (1 << 3) | ((IP_FORWARD) << 2))
 #endif
 
-void snmp_mib2_set_sysdescr(const u8_t* str, const u16_t* len); /* read-only be defintion */
+void snmp_mib2_set_sysdescr(const u8_t* str, const u16_t* len); /* read-only be definition */
 void snmp_mib2_set_syscontact(u8_t *ocstr, u16_t *ocstrlen, u16_t bufsize);
 void snmp_mib2_set_syscontact_readonly(const u8_t *ocstr, const u16_t *ocstrlen);
 void snmp_mib2_set_sysname(u8_t *ocstr, u16_t *ocstrlen, u16_t bufsize);

src/include/lwip/apps/snmp_threadsync.h

@@ -72,7 +72,7 @@ struct threadsync_data
   struct snmp_node_instance proxy_instance;
 };
 
-/** Thread sync instance. Needed EXCATLY once for every thread to be synced into. */
+/** Thread sync instance. Needed EXACTLY once for every thread to be synced into. */
 struct snmp_threadsync_instance
 {
   sys_sem_t                       sem;

src/include/lwip/arch.h

@@ -74,7 +74,7 @@
 
 /** Platform specific diagnostic output.<br>
  * Note the default implementation pulls in printf, which may
- * in turn pull in a lot of standard libary code. In resource-constrained
+ * in turn pull in a lot of standard library code. In resource-constrained
  * systems, this should be defined to something less resource-consuming.
  */
 #ifndef LWIP_PLATFORM_DIAG
@@ -85,7 +85,7 @@
 
 /** Platform specific assertion handling.<br>
  * Note the default implementation pulls in printf, fflush and abort, which may
- * in turn pull in a lot of standard libary code. In resource-constrained
+ * in turn pull in a lot of standard library code. In resource-constrained
  * systems, this should be defined to something less resource-consuming.
  */
 #ifndef LWIP_PLATFORM_ASSERT

src/include/lwip/opt.h

@@ -2834,7 +2834,7 @@
  *         the first 'opt1len' bytes and the rest starts at 'opt2'. opt2len can
  *         be simply calculated: 'opt2len = optlen - opt1len;'
  * - p: input packet, p->payload points to application data (that's why tcp hdr
- *      and options are passed in seperately)
+ *      and options are passed in separately)
  * Return value:
  * - ERR_OK: continue input of this packet as normal
  * - != ERR_OK: drop this packet for input (don't continue input processing)

src/include/lwip/prot/acd.h

@@ -73,7 +73,7 @@ typedef enum {
    * that stay active even if the netif has a routable address selected.
    * In such a case, we cannot defend our address */
   ACD_STATE_PASSIVE_ONGOING,
-  /* To many conflicts occured, we need to wait before restarting the selection
+  /* To many conflicts occurred, we need to wait before restarting the selection
    * process */
   ACD_STATE_RATE_LIMIT
 } acd_state_enum_t;

src/include/netif/ppp/magic.h

@@ -94,7 +94,7 @@ extern "C" {
 void magic_init(void);
 
 /*
- * Randomize our random seed value.  To be called for truely random events
+ * Randomize our random seed value.  To be called for truly random events
  * such as user operations and network traffic.
  */
 void magic_randomize(void);

src/include/netif/ppp/ppp_impl.h

@@ -265,7 +265,7 @@ extern int       maxoctets_timeout;  /* Timeout for check of octets limit */
 #define PPP_OCTETS_DIRECTION_IN         1
 #define PPP_OCTETS_DIRECTION_OUT        2
 #define PPP_OCTETS_DIRECTION_MAXOVERAL  3
-/* same as previos, but little different on RADIUS side */
+/* same as previous, but little different on RADIUS side */
 #define PPP_OCTETS_DIRECTION_MAXSESSION 4
 #endif