doc/codecs: Remove no longer existing options

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/codecs.texi

@@ -84,9 +84,6 @@ Apply interlaced motion estimation.
 Use closed gop.
 @end table
 
-@item sub_id @var{integer}
-Deprecated, currently unused.
-
 @item me_method @var{integer} (@emph{encoding,video})
 Set motion estimation method.
 
@@ -386,10 +383,6 @@ Possible values:
 
 @item simplemmx
 
-@item libmpeg2mmx
-
-@item mmi
-
 @item arm
 
 @item altivec
@@ -406,10 +399,6 @@ Possible values:
 
 @item simplealpha
 
-@item h264
-
-@item vp3
-
 @item ipp
 
 @item xvidmmx
@@ -772,8 +761,6 @@ Set noise reduction.
 Set number of bits which should be loaded into the rc buffer before
 decoding starts.
 
-@item inter_threshold @var{integer} (@emph{encoding,video})
-
 @item flags2 @var{flags} (@emph{decoding/encoding,audio,video})
 
 Possible values: