Multi-frame format is properly indexed. Dictionary at the beginning
is also supported.
-It is processed with with @command{unzstd} (@file{cmd/zstd/unzstd})
+It is processed with @command{unzstd} (@file{cmd/zstd/unzstd})
utility. It eats compressed stream from @code{stdin}, outputs
decompressed data to @code{stdout}, and prints each frame size with
corresponding decompressed data size to 3rd file descriptor (if it is