Update config file examples to mention stdout

conf/generic.conf

@@ -132,10 +132,12 @@
 %W%# "stdin" is not an audio device.  Don't use this unless you
 %W%# understand what this means.  Read the User Guide.
 %W%# You can also specify "UDP:" and an optional port for input.
-%W%# Something different must be specified for output.
+%W%# "-" or "stdout" can be used to pipe audio out to another application.
+%W%# The -O option must be specified on the command line to support this.
 %W%
 %W%# ADEVICE stdin 0
 %W%# ADEVICE UDP:7355 0
+%W%# ADEVICE stdin stdout
 %W%
 %W%# The position in the list can change when devices (e.g. USB) are added and removed.
 %W%# You can also specify devices by using part of the name.
@@ -158,10 +160,12 @@
 %L%# "stdin" is not an audio device.  Don't use this unless you
 %L%# understand what this means.  Read the User Guide.
 %L%# You can also specify "UDP:" and an optional port for input.
-%L%# Something different must be specified for output.
+%L%# "-" or "stdout" can be used to pipe audio out to another application.
+%L%# The -O option must be specified on the command line to support this.
 %L%
 %L%# ADEVICE stdin plughw:1,0
 %L%# ADEVICE UDP:7355 default
+%L%# ADEVICE stdin stdout
 %L%
 %R% ---------- Mac ----------
 %R%
@@ -183,9 +187,11 @@
 %M%# "stdin" is not an audio device.  Don't use this unless you
 %M%# understand what this means.  Read the User Guide.
 %M%# You can also specify "UDP:" and an optional port for input.
-%M%# Something different must be specified for output.
+%M%# "-" or "stdout" can be used to pipe audio out to another application.
+%M%# The -O option must be specified on the command line to support this.
 %M%
 %M%# ADEVICE UDP:7355 default
+%M%# ADEVICE stdin stdout
 %M%#
 %C%
 %C%#
@@ -607,4 +613,4 @@
 %C%#TTERR  NO_CALL          SPEECH  No call or object name.
 %C%#TTERR  SATSQ            SPEECH  Satellite square must be 4 digits.
 %C%#TTERR  SUFFIX_NO_CALL   SPEECH  Send full call before using suffix.
-%C%
+%C%