Documentation: sndmagic.h doesn't exist

It was added in 2.5.5 and removed in a 2.6.9 "ALSA CVS update", pre-git,
which states:
   Removal and replacement of magic memory allocators and casts
   (core part)
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Link: https://lore.kernel.org/r/09e56999b0b323fb0add61f7dbd8c9f0a576561a.1663280877.git.nabijaczleweli@nabijaczleweli.xyzSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/process/magic-number.rst

@@ -99,8 +99,3 @@ QUEUE_MAGIC_FREE      0xf7e1c9a3       queue_entry              ``drivers/scsi/a
 QUEUE_MAGIC_USED      0xf7e1cc33       queue_entry              ``drivers/scsi/arm/queue.c``
 NMI_MAGIC             0x48414d4d455201 nmi_s                    ``arch/mips/include/asm/sn/nmi.h``
 ===================== ================ ======================== ==========================================
-
-Note that there are also defined special per-driver magic numbers in sound
-memory management. See ``include/sound/sndmagic.h`` for complete list of them. Many
-OSS sound drivers have their magic numbers constructed from the soundcard PCI
-ID - these are not listed here as well.

Documentation/translations/it_IT/process/magic-number.rst

@@ -105,9 +105,3 @@ QUEUE_MAGIC_FREE      0xf7e1c9a3       queue_entry              ``drivers/scsi/a
 QUEUE_MAGIC_USED      0xf7e1cc33       queue_entry              ``drivers/scsi/arm/queue.c``
 NMI_MAGIC             0x48414d4d455201 nmi_s                    ``arch/mips/include/asm/sn/nmi.h``
 ===================== ================ ======================== ==========================================
-
-Da notare che ci sono anche dei numeri magici specifici per driver nel
-*sound memory management*. Consultate ``include/sound/sndmagic.h`` per una
-lista completa.  Molti driver audio OSS hanno i loro numeri magici costruiti a
-partire dall'identificativo PCI della scheda audio - nemmeno questi sono
-elencati in questo file.

Documentation/translations/zh_CN/process/magic-number.rst

@@ -91,7 +91,4 @@ QUEUE_MAGIC_USED      0xf7e1cc33       queue_entry              ``drivers/scsi/a
 NMI_MAGIC             0x48414d4d455201 nmi_s                    ``arch/mips/include/asm/sn/nmi.h``
 ===================== ================ ======================== ==========================================
 
-
-请注意，在声音记忆管理中仍然有一些特殊的为每个驱动定义的魔术值。查看include/sound/sndmagic.h来获取他们完整的列表信息。很多OSS声音驱动拥有自己从声卡PCI ID构建的魔术值-他们也没有被列在这里。
-
 IrDA子系统也使用了大量的自己的魔术值，查看include/net/irda/irda.h来获取他们完整的信息。

Documentation/translations/zh_TW/process/magic-number.rst

@@ -94,7 +94,4 @@ QUEUE_MAGIC_USED      0xf7e1cc33       queue_entry              ``drivers/scsi/a
 NMI_MAGIC             0x48414d4d455201 nmi_s                    ``arch/mips/include/asm/sn/nmi.h``
 ===================== ================ ======================== ==========================================
 
-
-請注意，在聲音記憶管理中仍然有一些特殊的爲每個驅動定義的魔術值。查看include/sound/sndmagic.h來獲取他們完整的列表信息。很多OSS聲音驅動擁有自己從音效卡PCI ID構建的魔術值-他們也沒有被列在這裡。
-
 IrDA子系統也使用了大量的自己的魔術值，查看include/net/irda/irda.h來獲取他們完整的信息。