doc PG10: add commit 090010f2e and adjust EXPLAIN SUMMARY item

Bruce Momjian <bruce@momjian.us>

Commit: 3640cf5e1c8a0ae6ac55bf6384de0521dc77facf
Author: Bruce Momjian <bruce@momjian.us>
Date: 2017-04-25T17:29:26Z
Releases: 10.0
doc PG10:  add commit 090010f2e and adjust EXPLAIN SUMMARY item

Reported-by: Tels, Andres Freund

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doc/src/sgml/release-10.sgml modified +15 −4

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