Fix #27: Add documentation for retrieving full RGB color palette

Add a note explaining how to retrieve the complete default RGB color palette
(all 128 entries from index 0 to 127) using the Get LED Color Palette Entry
sysex command (0x04). This addresses the request to document the full palette
beyond the subset currently shown in the documentation.

Author: Brody Nielsen

doc/AbletonPush2MIDIDisplayInterface.asc

@@ -501,6 +501,12 @@ will be retained, most likely.
                 |7   |127         |white
 |===
 
+NOTE: The table above shows only a subset of the RGB color palette values.
+To retrieve the complete default RGB color palette (all 128 entries from index 0 to 127),
+use the "Get LED Color Palette Entry" sysex command (0x04) described in the
+<<RGB LED Color Processing>> chapter. Query each color index from 0 to 127 to
+obtain the full palette with RGB and white values for each entry.
+
 [id="White Balance"]
 White Balance
 ^^^^^^^^^^^^^