Rollup merge of #39777 - mina86:gib, r=steveklabnik
Rollup merge of #39777 - mina86:gib, r=steveklabnik

book: binary prefixed are defined by IEC and not in SI

Binary prefixes (such as Gi for ‘gibi-’ in GiB) are defined by
International Electrotechnical Commission (IEC) and not in the
International System of Units (SI).

Though to be honest I’d just reword the previous paragraph to use ‘1 GiB’.

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