Improved comments in config.txt

Change-Id: I8cd22f2640262bc77cf9a6977aeeb3aaa6ef058c

src/scripts/config.txt

@@ -1,34 +1,43 @@
 # config.txt for PiTubeDirect (https://github.com/hoglet67/PiTubeDirect)
 #
 
-# Over clocking settings for Pi Zero
+# Settings for Pi Zero
 [pi0]
 arm_freq=1000
 core_freq=400
 kernel=kernelrpizero.img
+# Debug kernel (needs a 115200 serial connection)
+#kernel=debug/kernelrpizero.img
 
-# Over clocking settings for Pi 1
+# Settings for Pi 1 Model B and B+
+# Use kernelrpi.img for Pi 1 Model B Rev 1.0
+# Use kernelrpibplus.img for all other Pi 1 models (inc B+)
 [pi1]
 arm_freq=700
 core_freq=350
 kernel=kernelrpi.img
 #kernel=kernelrpibplus.img
+# Debug kernel (needs a 115200 serial connection)
+#kernel=debug/kernelrpi.img
+#kernel=debug/kernelrpibplus.img
 
-#swap the above to lines if you an original rpi B+ ( 40 pins)
-
-# Over clocking settings for Pi 2
+# Settings for Pi 2
 [pi2]
 arm_freq=900
 core_freq=350
 kernel=kernelrpi2.img
+# Debug kernel (needs a 115200 serial connection)
+#kernel=debug/kernelrpi2.img
 
-# Over clocking settings for Pi 3
+# Settings for Pi 3
 [pi3]
 arm_freq=1200
 core_freq=400
 kernel=kernelrpi3.img
+# Debug kernel (needs a 115200 serial connection)
+#kernel=debug/kernelrpi3.img
 
-
+# Global settings
 [all]
 force_turbo=1