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We had an index entry for "median" attached to the percentile_cont function entry, which was pretty useless because a person following the link would never realize that that function was the one they were being hinted to use. Instead, make the index entry point at the example in syntax-aggregates, and add a <seealso> link to "percentile". Also, since that example explicitly claims to be calculating the median, make it use percentile_cont not percentile_disc. This makes no difference in terms of the larger goals of that section, but so far as I can find, nearly everyone thinks that "median" means the continuous not discrete calculation. Per gripe from Steven Winfield. Back-patch to 9.4 where we introduced percentile_cont. Discussion: https://postgr.es/m/20161223102056.25614.1166@wrigleys.postgresql.org
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