doc/resampler.texi: add missing swr channel layout options

Signed-off-by: James Almer <jamrial@gmail.com>

doc/resampler.texi

@@ -11,16 +11,6 @@ programmatic use.
 
 @table @option
 
-@item ich, in_channel_count
-Set the number of input channels. Default value is 0. Setting this
-value is not mandatory if the corresponding channel layout
-@option{in_channel_layout} is set.
-
-@item och, out_channel_count
-Set the number of output channels. Default value is 0. Setting this
-value is not mandatory if the corresponding channel layout
-@option{out_channel_layout} is set.
-
 @item uch, used_channel_count
 Set the number of used input channels. Default value is 0. This option is
 only used for special remapping.
@@ -41,8 +31,8 @@ Specify the output sample format. It is set by default to @code{none}.
 Set the internal sample format. Default value is @code{none}.
 This will automatically be chosen when it is not explicitly set.
 
-@item icl, in_channel_layout
-@item ocl, out_channel_layout
+@item ichl, in_chlayout
+@item ochl, out_chlayout
 Set the input/output channel layout.
 
 See @ref{channel layout syntax,,the Channel Layout section in the ffmpeg-utils(1) manual,ffmpeg-utils}