sound: remove reference to feature-removal-schedule.txt

In commit 9c0ece06 ("Get rid of Documentation/feature-removal.txt"),
Linus removed feature-removal-schedule.txt from Documentation, but there
is still some reference to this file.  So remove them.
Signed-off-by: NTao Ma <boyu.mt@taobao.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

sound/Kconfig

@@ -52,9 +52,6 @@ config SOUND_OSS_CORE_PRECLAIM
 
 	  Disabling this allows alternative OSS implementations.
 
-	  Please read Documentation/feature-removal-schedule.txt for
-	  details.
-
 	  If unsure, say Y.
 
 source "sound/oss/dmasound/Kconfig"

sound/sound_core.c

@@ -146,8 +146,7 @@ extern int msnd_pinnacle_init(void);
  * devices only the standard chrdev aliases are requested.
  *
  * All these clutters are scheduled to be removed along with
- * sound-slot/service-* module aliases.  Please take a look at
- * feature-removal-schedule.txt for details.
+ * sound-slot/service-* module aliases.
  */
 #ifdef CONFIG_SOUND_OSS_CORE_PRECLAIM
 static int preclaim_oss = 1;