Steam format channel count defines missing from documentation

[xross]

i.e.
HS_STREAM_FORMAT_INPUT_1_CHAN_COUNT
HS_STREAM_FORMAT_INPUT_2_CHAN_COUNT
HS_STREAM_FORMAT_INPUT_3_CHAN_COUNT

HS_STREAM_FORMAT_OUTPUT_1_CHAN_COUNT
HS_STREAM_FORMAT_OUTPUT_2_CHAN_COUNT
HS_STREAM_FORMAT_OUTPUT_3_CHAN_COUNT

STREAM_FORMAT_INPUT_2_RESOLUTION_BITS
STREAM_FORMAT_INPUT_3_RESOLUTION_BITS

HS_STREAM_FORMAT_INPUT_2_SUBSLOT_BYTES
HS_STREAM_FORMAT_INPUT_3_SUBSLOT_BYTES

FS_STREAM_FORMAT_INPUT_2_SUBSLOT_BYTES
FS_STREAM_FORMAT_INPUT_3_SUBSLOT_BYTES

STREAM_FORMAT_INPUT_2_DATAFORMAT
STREAM_FORMAT_INPUT_2_DATAFORMAT

[JLimbocker]

Also note that lib_xua/doc/rst/opt_audio_format.rst:29 contains a note saying
Currently only a single format is supported for the recording stream