aucat -> sndiod in intro(3) manual page

[David Demelier]

Hi,

Just fix sndiod reference rather than aucat to sio_open in intro(3).

Index: share/man/man3/intro.3
===================================================================
RCS file: /cvs/src/share/man/man3/intro.3,v
retrieving revision 1.96
diff -u -r1.96 intro.3
--- share/man/man3/intro.3      10 Jun 2021 13:13:38 -0000      1.96
+++ share/man/man3/intro.3      20 Feb 2023 13:33:40 -0000
@@ -332,7 +332,7 @@
 Library for
 .Xr audio 4
 hardware and the
-.Xr aucat 1
+.Xr sndiod 8
 audio server.
 See
 .Xr sio_open 3 .