fix: typo raised by spellcheck

Author: fpistm

src/lwipopts_default.h

@@ -51,7 +51,7 @@ 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        6
-/* 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        10
 /* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
@@ -60,7 +60,7 @@ 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        8
-/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
+/* MEMP_NUM_SYS_TIMEOUT: the number of simultaneously active
    timeouts. */
 #define MEMP_NUM_SYS_TIMEOUT    10