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Extended statistics commit7b504eb282
did not include appropriate documentation next to where we document regular planner statistics (I ripped what was submitted before commit and then forgot to put it back), and while later commit2686ee1b7c
added some material, it structurally depended on what I had ripped out, so the end result wasn't proper. Fix those problems by shuffling what was added by2686ee1b7c
and including some additional material, so that now chapter 14 "Performance Tips" now describes the types of multivariate statistics we currently have, and chapter 68 "How the Planner Uses Statistics" shows some examples. The new text should be more in line with previous material, in (hopefully) the appropriate depth. While at it, fix a small bug in pg_statistic_ext docs: one column was listed in the wrong spot.