[docs] Use binary prefixes (issue 17193)

[ezio.melotti at gmail.com]

http://bugs.python.org/review/17193/diff/7360/Doc/howto/unicode.rst
File Doc/howto/unicode.rst (right):

http://bugs.python.org/review/17193/diff/7360/Doc/howto/unicode.rst#newcode459
Doc/howto/unicode.rst:459: chunks (say, 1 KiB or 4 KiB), you need to
write error-handling code to catch the case
I would leave this alone, or possibly change it to "1k or 4k bytes".

http://bugs.python.org/review/17193/diff/7360/Doc/library/lzma.rst
File Doc/library/lzma.rst (right):

http://bugs.python.org/review/17193/diff/7360/Doc/library/lzma.rst#newcode161
Doc/library/lzma.rst:161: :class:`LZMACompressor` object can be as high
as 800 MiB. For this reason,
Why is this MiB?

http://bugs.python.org/review/17193/diff/7360/Doc/library/lzma.rst#newcode306
Doc/library/lzma.rst:306: 1.5 GiB (inclusive).
Ditto.

http://bugs.python.org/review/17193/diff/7360/Doc/library/os.rst
File Doc/library/os.rst (right):

http://bugs.python.org/review/17193/diff/7360/Doc/library/os.rst#newcode2332
Doc/library/os.rst:2332: is 64 kibibytes on Linux.
I would use KiB.

http://bugs.python.org/review/17193/diff/7360/Doc/library/tarfile.rst
File Doc/library/tarfile.rst (right):

http://bugs.python.org/review/17193/diff/7360/Doc/library/tarfile.rst#newcode672
Doc/library/tarfile.rst:672: maximum file size is 8 gibibytes. This is
an old and limited but widely
GiB

http://bugs.python.org/review/17193/diff/7360/Doc/library/tarfile.rst#newcode676
Doc/library/tarfile.rst:676: linknames, files bigger than 8 gibibytes
and sparse files. It is the de facto
Ditto.

http://bugs.python.org/review/17193/