[docs] [issue25605] fcntl doc: document exceptions raised on error for ioctl() and flock()

[Martin Panter]

Martin Panter added the comment:

This looks good for Python 2 and the equivalent for Python 3.

FWIW the ValueError case is platform-dependent. On Linux, I see EINVAL (the IOError version of ValueError):

>>> flock(0, LOCK_UN)
>>> flock(0, 0)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: [Errno 22] Invalid argument

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nosy: +martin.panter

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