Add an MLINKS entry which makes snd(4) a link for pcm(4).

Suggested by:	Udo Erdelhoff <ue@nathan.ruhr.de>

share/man/man4/Makefile

@@ -26,6 +26,7 @@ MLINKS+=ipfirewall.4 ipacct.4 ipfirewall.4 ipaccounting.4 ipfirewall.4 ipfw.4
 MLINKS+=lp.4 plip.4
 MLINKS+=mem.4 kmem.4
 MLINKS+=netintro.4 networking.4
+MLINKS+=pcm.4 snd.4
 MLINKS+=pcvt.4 vt.4
 MLINKS+=scsi.4 CAM.4
 MLINKS+=scsi.4 SCSI.4

share/man/man4/pcm.4

@@ -29,7 +29,8 @@
 .Dt PCM 4
 .Os FreeBSD
 .Sh NAME
-.Nm pcm
+.Nm pcm ,
+.Nm snd
 .Nd FreeBSD PCM audio device driver
 .Sh SYNOPSIS
 For a card with bridge driver support, and a PnP card: