Update documentation for new feature

Author: dhowland

docs/source/functions.rst

@@ -28,6 +28,8 @@ SCANCODE_BL_MODE           Cycle through the backlighting modes (static,
 SCANCODE_BL_ENABLE         Enable/disable the backlight and cycle through the
                            different lighting zones
 
+SCANCODE_KEEPAWAKE         (toggle) Jiggle the mouse by imperceptible amounts to
+                           keep the attached PC awake.
 SCANCODE_KEYLOCK           (toggle) Disable sending scancodes to PC
 SCANCODE_WINLOCK           (toggle) Disable the windows key
 SCANCODE_ESCGRAVE          Acts like grave key if shift is pressed (to make tilde).

docs/source/leds.rst

@@ -76,6 +76,9 @@ Here is an explanation of all LED functions:
 'USB Init', 'USB Error', 'USB Suspend', 'USB Normal'
     Indicates the status of the USB connection to the host.
 
+'Keep Awake'
+    Lights up when the Keep Awake function is active.
+
 LED Auto Layer Select
 ---------------------