clarify documentation for IOBuf::length()
Summary: The documentation on length() is somewhat ambiguous when dealing with chains of IOBufs -- it is only clear after reading implementations that "data" refers to "the data in this single IOBuf, potentially only part of a chain". Reviewed By: yfeldblum Differential Revision: D15830189 fbshipit-source-id: d3319abd2d53a76665442d1b93b78a7d1a77dcc0
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