Add a documentation about Unix.file_descr, files, sockets and Miou_unix #43
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It's legitimate to want to homogenise Miou_unix with the Unix module, but the former has other objectives than offering all the possible system syscalls. In fact, Miou_unix is more concerned with the use of file_descr that can block (such as sockets) but does not concern file manipulation. This commit adds documentation on this subject so that the user understands the difference between Miou_unix.file_descr and Unix.file_descr and why the latter can be used just as much in the context of Miou as the former.