Fix typos

From patch #10399

contrib/examples/example_app/lwipopts.h

@@ -130,7 +130,7 @@ a lot of data that needs to be copied, this should be set high. */
 /* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
    per active UDP "connection". */
 #define MEMP_NUM_UDP_PCB        8
-/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
+/* MEMP_NUM_TCP_PCB: the number of simultaneously active TCP
    connections. */
 #define MEMP_NUM_TCP_PCB        5
 /* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
@@ -139,7 +139,7 @@ a lot of data that needs to be copied, this should be set high. */
 /* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
    segments. */
 #define MEMP_NUM_TCP_SEG        16
-/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
+/* MEMP_NUM_SYS_TIMEOUT: the number of simultaneously active
    timeouts. */
 #define MEMP_NUM_SYS_TIMEOUT    17
 

src/include/lwip/apps/sntp_opts.h

@@ -158,14 +158,14 @@
 
 /** SNTP receive timeout - in milliseconds
  * Also used as retry timeout - this shouldn't be too low.
- * Default is 15 seconds. Must not be beolw 15 seconds by specification (i.e. 15000)
+ * Default is 15 seconds. Must not be below 15 seconds by specification (i.e. 15000)
  */
 #if !defined SNTP_RECV_TIMEOUT || defined __DOXYGEN__
 #define SNTP_RECV_TIMEOUT           15000
 #endif
 
 /** SNTP update delay - in milliseconds
- * Default is 1 hour. Must not be beolw 60 seconds by specification (i.e. 60000)
+ * Default is 1 hour. Must not be below 60 seconds by specification (i.e. 60000)
  */
 #if !defined SNTP_UPDATE_DELAY || defined __DOXYGEN__
 #define SNTP_UPDATE_DELAY           3600000