[issue21146] update gzip usage examples in docs

[Wolfgang Maier]

Wolfgang Maier added the comment:

>> with open(src, 'rb') as f_in:
>>     with gzip.open(dst, 'wb') as f_out:
>>        shutil.copyfileobj(f_in, f_out)

+1 !!
exactly as fast as my suggestion (with compression and de-compression), but a lot clearer !
Hadn't thought of it.

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