Tidy up, add design notes

Hardware/keyboard_controller/block/ideal_diode.kicad_sch

@@ -722,6 +722,17 @@
 		)
 		(uuid "c51ea670-c8f2-4f1c-9e16-0f1b2ebf2915")
 	)
+	(text "Ideal diode\nRequires well matched BJTs\n\nAlternative: DMMT5401, BC857B is cheaper\n\nNotes on blog https://www.microfarad.de/blog/the-ideal-diode/\nare pertinent wrt soft startup. May be fixable with gate drive?"
+		(exclude_from_sim no)
+		(at 162.56 93.472 0)
+		(effects
+			(font
+				(size 1.27 1.27)
+				(thickness 0.1588)
+			)
+		)
+		(uuid "e6ca7016-c20c-4334-977d-01387b1a4bef")
+	)
 	(junction
 		(at 88.9 76.2)
 		(diameter 0)