Well that is interesting. From a quick check it appears that wording first appears in 4.6.1 and continues in 4.7.0. I suspect that the original use of the word Packet was a mistake in the original method name (cause as misty83 points out, how big would the packets be?) that has been corrected in the documentation.

In any case my use of the function gives results that make sense IAW the 4.6.1 documentation, even on devices running earlier OSs.