Document i2c_ASN1_INTEGER(3).
While it was probably a mistake that steve@ made some i2c_*() and c2i_*()
functions public back in 2000 and while we would like to delete them from
the API, it may not be possible to delete this particular function because
in contrast to the others (which are already marked as intentionally
undocumented), this one is used by various real-world software, so for now,
explain what it does, just in case people find it in existing code.
While here, use the familiar term "byte" that we generally use
throughout all our manual pages, even though the ASN.1 standard
uses the term "octet" instead, which is more precise only in theory.
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