Move "no name changes" from compression to checksum table

Compression names actually aren't used in dedup table names, but
checksum names are.

Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Closes openzfs#16776

module/zfs/zio_checksum.c

@@ -160,6 +160,12 @@ abd_fletcher_4_byteswap(abd_t *abd, uint64_t size,
 	abd_fletcher_4_impl(abd, size, &acd);
 }
 
+/*
+ * Checksum vectors.
+ *
+ * Note: you cannot change the name string for these functions, as they are
+ * embedded in on-disk data in some places (eg dedup table names).
+ */
 zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS] = {
 	{{NULL, NULL}, NULL, NULL, 0, "inherit"},
 	{{NULL, NULL}, NULL, NULL, 0, "on"},

module/zfs/zio_compress.c

@@ -44,10 +44,6 @@ static unsigned long zio_decompress_fail_fraction = 0;
 
 /*
  * Compression vectors.
- *
- * NOTE: DO NOT CHANGE THE NAMES OF THESE COMPRESSION FUNCTIONS.
- * THEY ARE USED AS ZAP KEY NAMES BY FAST DEDUP AND THEREFORE
- * PART OF THE ON-DISK FORMAT.
  */
 zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS] = {
 	{"inherit",	0,	NULL,	NULL, NULL},