ALSA: docs: Fix typo

Signed-off-by: Jakub Wilk <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

Documentation/sound/designs/powersave.rst

···
 
 Note that you might hear click noise/pop when changing the power
 state.  Also, it often takes certain time to wake up from the
-power-down to the active state.  These are often hardly to fix, so
+power-down to the active state.  These are often hard to fix, so
 don't report extra bug reports unless you have a fix patch ;-)
 
 For HD-audio interface, there is another module option,