[issue21146] update gzip usage examples in docs

[Wolfgang Maier]

Wolfgang Maier added the comment:

same speed is not surprising though as shutil.copyfileobj is implemented like this:

def copyfileobj(fsrc, fdst, length=16*1024):
    """copy data from file-like object fsrc to file-like object fdst"""
    while 1:
        buf = fsrc.read(length)
        if not buf:
            break
        fdst.write(buf)

which is essentially what I was proposing :)

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<http://bugs.python.org/issue21146>
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