ALSA: Add sound/core/jack.c to driver-API docbook entry

Signed-off-by: Takashi Iwai <tiwai@suse.de>

Documentation/sound/alsa/DocBook/alsa-driver-api.tmpl

@@ -88,6 +88,9 @@
   <chapter><title>Miscellaneous Functions</title>
      <sect1><title>Hardware-Dependent Devices API</title>
 !Esound/core/hwdep.c
+     </sect1>
+     <sect1><title>Jack Abstraction Layer API</title>
+!Esound/core/jack.c
      </sect1>
      <sect1><title>ISA DMA Helpers</title>
 !Esound/core/isadma.c