core: small spelling fix (bellow -> below)

src/core/flags.c

@@ -302,7 +302,7 @@ static int fixup_t_flag(void** param, int param_no)
 
 	if (*code < FL_MAX && token==0) {
 		LM_ERR("TM module: too high flag number: %s (%d)\n; lower number"
-			" bellow %d reserved\n", (char *) (*param), *code, FL_MAX );
+			" below %d reserved\n", (char *) (*param), *code, FL_MAX );
 		goto error;
 	}
 

src/core/receive.c

@@ -202,7 +202,7 @@ int receive_msg(char *buf, unsigned int len, struct receive_info *rcv_info)
 	/* fill in msg */
 	msg->buf = buf;
 	msg->len = len;
-	/* zero termination (termination of orig message bellow not that
+	/* zero termination (termination of orig message below not that
 	 * useful as most of the work is done with scratch-pad; -jiri  */
 	/* buf[len]=0; */ /* WARNING: zero term removed! */
 	msg->rcv = *rcv_info;

src/core/tcp_read.c

@@ -1333,7 +1333,7 @@ static int hep3_process_msg(char* tcpbuf, unsigned int len,
 	/* fill in msg */
 	msg.buf=tcpbuf;
 	msg.len=len;
-	/* zero termination (termination of orig message bellow not that
+	/* zero termination (termination of orig message below not that
 	 * useful as most of the work is done with scratch-pad; -jiri  */
 	/* buf[len]=0; */ /* WARNING: zero term removed! */
 	msg.rcv=*rcv_info;