doc: add the missing documentation of key repeat settings on Windows …

…in `keymap/tutorial.kbd`

keymap/tutorial.kbd

@@ -129,6 +129,18 @@
  programs that capture keyboard input like AHK. You specify windows output using:
  (send-event-sink)
 
+ Specific to Windows, KMonad also handles key auto-repeat. Therefore your
+ Windows system settings for key repeat delay and key repeat rate will have no
+ effect when KMonad is running. To set the repeat delay and rate from KMonad,
+ pass the optional arguments pair to `send-event-sink`:
+ (send-event-sink [ <delay> <rate> ])
+ where:
+ <delay> : how many ms before a key starts repeating
+ <rate> : how many ms between each repeat event
+ A value of 500 ms delay and 30 ms rate should mimic the default Windows
+ settings pretty well:
+ (send-event-sink 500 30)
+
 
  -- Mac OS -----