Update documentation on the Key action's specification format

The documentation now mentions that both pause fields (innerpause
and outerpause) should be given pause values in hundredths of a
second.  This factor is the same one used by the Pause action.

dragonfly/actions/action_key.py

@@ -69,11 +69,15 @@
    :ref:`RefKeySpecNames`.
  - *innerpause* --
    The time to pause between repetitions of this keystroke.
+   It should be given in hundredths of a second.  For
+   example, "20" will pause for 20/100s = 0.2 seconds.
  - *repeat* --
    The number of times this keystroke should be repeated.
    If not specified, the key will be pressed and released once.
  - *outerpause* --
    The time to pause after this keystroke.
+   It should be given in hundredths of a second.  For
+   example, "20" will pause for 20/100s = 0.2 seconds.
  - *direction* --
    Whether to press-and-hold or release the key.  Must be
    one of the following: