Fix two comments that were innocent victims of a long-ago search-and-replace from "hex" to ".byte $".

src/shell/main.asm

@@ -7628,7 +7628,6 @@ err_text:
 	ErrorEntry der_baddev, "devnum format is .61"
 	ErrorEntry der_abort, "aborted"
 	ErrorEntry der_waitspool, "wait for files to print or use spool -z"
-;; [TODO] Remove...unused for decades?	ErrorEntry $88, "illegal block read/write"
 	ErrorEntry der_needs3, "filetype needs 3 chars"
 	ErrorEntry der_missopt, "missing option"
 	ErrorEntry der_badhware, "missing hardware"

src/xtn/2/dump.asm

@@ -106,7 +106,7 @@ no_end:
 	lsr skip_asc
 not_both	= *
 ;
-; Width (bytes per line) = 16 if .byte $is being printed,
+; Width (bytes per line) = 16 if hex is being printed,
 ; otherwise 64 (whether ASCII is there or not)
 ;
 	lda #16

src/xtn/2/park.asm

@@ -445,7 +445,7 @@ Seek_DCB:	.byte $0B	; Set as Seek Opcode.
 	.byte $07	;
 	.addr Paramtrs	; Not actually used by Seek command,
 ;                           but must be included.
-Rom_IDs:	.byte $A9,$20,$A9,$00 ; First 14 .byte $values in Host adapter.
+Rom_IDs:	.byte $A9,$20,$A9,$00 ; First 14 HEX values in Host adapter.
 	.byte $A9,$03,$A9,$3C
 	.byte $2C,$FF,$CF,$20
 	.byte $0C,$C8