docs(arnitech): the controller's code is in the mc64blade build too

ARNITECH_CONTROLLER is on in mc64 and mc64blade, so the headers of the
controller's, the TOD's, and the network's code, the jump table's, and
CONFIG.md no longer say mc64 only.

src/kernal/arnitech/ff00.arnitech_jumptable.s

@@ -2,9 +2,10 @@
 ;; #LAYOUT# *   *        #IGNORE
 
 ;
-; The Arnitech jump table (mc64 only): thin wrappers over the Arnitech controller's registers
-; (arnitech's ADR 0023), at fixed addresses. Software finds it by reading "ARNI" at $FF00 with
-; the KERNAL banked in; on any other KERNAL it uses the registers themselves, which work the same.
+; The Arnitech jump table (mc64 and mc64blade): thin wrappers over the Arnitech controller's
+; registers (arnitech's ADR 0023), at fixed addresses. Software finds it by reading "ARNI" at
+; $FF00 with the KERNAL banked in; on any other KERNAL it uses the registers themselves, which
+; work the same.
 ; Entries are only ever added, after the last, with the version and count raised; $FF48-$FF80
 ; stay clear, for the stock IRQ entry, CINT, and the KERNAL revision byte.
 ;