Luminary-icdi comment update

Clarify that ICDI is the generic logic, but this config is
for the JTAG-only (no-SWD) mode.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

tcl/interface/luminary-icdi.cfg

@@ -2,6 +2,10 @@
 # Luminary Micro Stellaris LM3S9B9x Evaluation Kits
 # In-Circuit Debug Interface (ICDI) Board
 #
+# Essentially all Luminary debug hardware is the same, (with both
+# JTAG and SWD support compatible with ICDI boards.  This ICDI adapter
+# configuration is JTAG-only, but the same hardware handles SWD too.
+#
 # This is a discrete FT2232 based debug board which supports ARM's
 # JTAG/SWD connectors in both backwards-compatible 20-pin format and
 # in the new-style compact 10-pin.  There's also an 8-pin connector