Update buffer.md
The byteOffset parameter of the buf.lastIndexOf(value[, byteOffset][, encoding]) method should be described as Where to end searching in buf. rather than Where to begin searching in buf. since it is pretty misleading.
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The byteOffset parameter of the buf.lastIndexOf(value[, byteOffset][, encoding]) method should be described as Where to end searching in buf. rather than Where to begin searching in buf. since it is pretty misleading.