Confusing wording for a line in large_bins.md

[k4lizen]

When malloc attempts to iterate through the skip list, it will start with the chunk that is pointed to by the "head bin chunk's" fd ptr, and begin iterating through the skip list from that chunk.

You probably meant "malloc" as in the whole algorithm, but to me it initially came off as "when a chunk is allocated [malloc() is called] from a large bin, the large bin is traversed from the front", when its actually traversed from the back, as is later clarified in the file.