aper: Update spec references for length determinants

What's seems to be newish available ITU-T X.691 (02/2021),
has the related section at 11.9, not 10.9.

skeletons/aper_support.c

@@ -32,14 +32,14 @@ aper_get_length(asn_per_data_t *pd, int range, int ebits, int *repeat) {
 
 	value = per_get_few_bits(pd, 8);
 	if(value < 0) return -1;
-	if((value & 128) == 0)  /* #10.9.3.6 */
+	if((value & 128) == 0)  /* #11.9.3.6 */
 		return (value & 0x7F);
-	if((value & 64) == 0) { /* #10.9.3.7 */
+	if((value & 64) == 0) { /* #11.9.3.7 */
 		value = ((value & 63) << 8) | per_get_few_bits(pd, 8);
 		if(value < 0) return -1;
 		return value;
 	}
-	value &= 63;	/* this is "m" from X.691, #10.9.3.8 */
+	value &= 63;	/* this is "m" from X.691, #11.9.3.8 */
 	if(value < 1 || value > 4)
 		return -1;
 	*repeat = 1;
@@ -162,18 +162,18 @@ aper_put_length(asn_per_outp_t *po, int range, size_t length, int *need_eom) {
 
 	ASN_DEBUG("APER put length %zu with range %d", length, range);
 
-	/* 10.9 X.691 Note 2 */
+	/* 11.9 X.691 Note 2 */
 	if (range <= 65536 && range >= 0)
 		return aper_put_nsnnwn(po, range, length) ? -1 : (ssize_t)length;
 
 	if (aper_put_align(po) < 0)
 		return -1;
 
-	if(length <= 127) { /* #10.9.3.6 */
+	if(length <= 127) { /* #11.9.3.6 */
 		return per_put_few_bits(po, length, 8)
 		? -1 : (ssize_t)length;
 	}
-	else if(length < 16384) /* #10.9.3.7 */
+	else if(length < 16384) /* #11.9.3.7 */
 		return per_put_few_bits(po, length|0x8000, 16)
 		? -1 : (ssize_t)length;
 
@@ -193,7 +193,7 @@ int
 aper_put_nslength(asn_per_outp_t *po, size_t length) {
 
 	if(length <= 64) {
-		/* #10.9.3.4 */
+		/* #11.9.3.4 */
 		if(length == 0) return -1;
 		return per_put_few_bits(po, length-1, 7) ? -1 : 0;
 	} else {