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Hide uncoupled in opusenc. It's being confused as something to increase quality.

The option was added primarily for multistream debugging. I don't believe anyone
 is currently using it, but I'll leave it in for now for compatibility and because
 my own test scripts use it.

Uncouplued is not something people should normally be setting as it results in
 lower quality streams which are gratuitously RTP incompatible.

--- a/man/opusenc.1

+++ b/man/opusenc.1

@@ -44,8 +44,6 @@

 .B --set-ctl-int

 .I ctl=value

 ] [

-.B --uncoupled

-] [

 .B --comment

 .I tag=value

 ] [

@@ -126,8 +124,6 @@

 Preface with s: to direct the ctl to multistream s

 .br

 This may be used multiple times

-.IP "--uncoupled"

-Use one mono stream per channel

 .IP "--comment tag=value"

 Add an extra comment.  This may be used multiple times, and all

 instances will be added to each of the input files specified. The argument

--- a/src/opusenc.c

+++ b/src/opusenc.c

@@ -141,7 +141,6 @@

   printf(" --set-ctl-int x=y  Pass the encoder control x with value y (advanced)\n");

   printf("                      Preface with s: to direct the ctl to multistream s\n");

   printf("                      This may be used multiple times\n");

-  printf(" --uncoupled        Use one mono stream per channel\n");

   printf("\nMetadata options:\n");

   printf(" --comment          Add the given string as an extra comment\n");

   printf("                      This may be used multiple times\n");