Let's improve the readability of the docs by removing the archaic term "subcontrary mean".  That is a bit saying that capacitors are sometimes called condensers.

I checked with a stats professor and he had never heard of the term.  Likewise, there was no mention in any of my stats books or math references (such as the CRC).  The docs for scipy.stats.hmean() do not use the term.   Googling for "subcontrary mean" only turns up a cross-reference in Wolfram Alpha".