[AD] AUDIOSTREAM documentation

[Tore H. <gn...@gm...>]

Since the documentation for play_audio_stream() tells you to use the
AUDIOSTREAM structure's "voice" member, doesn't it make sense that it
should appear in "Structures and types defined by Allegro"? The entry
for AUDIOSTREAM is currently blank except for " A structure holding an
audiostream. Read chapter "Audio stream routines" for a description on
how to obtain/use this structure.".
Most of the struct consists of internal stuff, but "voice" should
definitely be in there, as well as possibly "len" (the buffer
length)...


I can attach a patch for allegro._tx if anyone's interested.

/T

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